For Minnesota Vikings fans, the days of traveling to Mankato for training camp are in the rearview mirror. It's a weird feeling for some (especially this Minnesota State grad), but the exciting Eagan era is just a few short weeks away. As the Vikings prepare to host their first-ever training camp at TCO Performance Center, here are six developing storylines that will be worth monitoring in the weeks ahead.\r\n1. Plenty of position battles\r\nKicker:\u00a0Kai Forbath vs.\u00a0Daniel Carlson\r\nIt's a classic veteran vs. rookie showdown. Although Kai Forbath had a decent season last year (he made 32 of 38 field goals) \u2014 he missed five extra points. Seeing a need to be more consistent in the kicking department, the Vikings selected Daniel\u00a0Carlson in the fifth round of April's draft. Due to his solid kicking in OTAs, big leg and draft position, Carlson should be considered the heavy favorite to land the job.\r\n\r\nThe last time the Vikings drafted a kicker was in 2012 when\u00a0Blair Walsh was selected in the sixth round. Walsh went on to make 35-of-38 field goals that season, including 10-of-10 from 50+ yards. In 2016, his last season with the Vikings, Walsh went 12-of-16 with four missed extra points in nine games before being replaced by Forbath.\r\nNickel cornerback: Mackensie Alexander vs. Mike Hughes\r\nTrae Waynes\u00a0proved last season that he's a capable counterpart to star corner\u00a0Xavier Rhodes. So with Waynes and Rhodes locking up the two outside CB positions, who will man the slot? Last season it was veteran\u00a0Terence Newman\u00a0that earned the majority of snaps at nickel cornerback with\u00a0Mackensie Alexander\u00a0seeing time there as well. This season, it appears rookie\u00a0Mike Hughes\u00a0may be the one stealing snaps away from Alexander.\r\n\r\nAlthough Alexander saw the most first-team reps in OTAs, Hughes impressed coaches this spring and is reportedly very much in the mix for snaps in the nickel package.\u00a0It remains to be seen how things will play out, but the improved play of Alexander, the acquisitions of Hughes and Holton Hill\u00a0and a possible position change for Newman are all signs that point to the likely end of the 39 year-old's reign as the regular nickelback.\r\nThird running back:\u00a0Mack Brown vs.\u00a0Roc Thomas\u00a0vs.\u00a0Mike Boone\r\nDalvin Cook and Latavius Murray are clearly number one and two atop the Vikings running back depth chart. After that, well... it's anyone's guess. The Vikings acquired\u00a0Mack Brown\u00a0last season off waivers from Washington's practice squad. The 26 year-old saw action at RB3 during spring practices but appeared to be limited during the team's minicamp.\r\n\r\nThe other contenders, Roc Thomas\u00a0and\u00a0Mike Boone,\u00a0are both undrafted rookies. Thomas, 22, is a year younger but Boone stood out during OTAs. He received the bulk of the\u00a0action at RB3 during the team's minicamp and appears to be slightly ahead of the other two in what could be the most compelling competition of camp.\r\nBackup quarterback:\u00a0Trevor Siemian vs. Kyle Sloter\r\nKirk Cousins is entrenched at QB1, but what about QB2? This offseason the Vikings traded for\u00a0Trevor Siemian\u00a0who was Denver's Week 1 starter in 2016 and 2017. He started 24 games the last two seasons, including ten last year. While he wasn't great as a starter for the Broncos (13-11 record, 5,700 yards, 30 TD, 24 INTs, 59.3% completion rate), he does have substantial starting experience. Considering\u00a0Kyle Sloter has yet to appear in a regular season game, it's clear Siemian is the favorite to land the backup job.\r\nThird wide receiver:\u00a0Kendall Wright vs. Laquon Treadwell\r\nThe receiver job behind Adam Thielen and\u00a0Stefon Diggs\u00a0is up for grabs and\u00a0Laquon Treadwell is doing his best to seize it. The former first-round pick was targeted early and often during spring practices and didn't disappoint. In what could be a make-or-break season for the 23 year-old, Treadwell will compete with newcomer\u00a0Kendall Wright\u00a0for a role that should be quite prominent in the Vikings' new offense.\r\nDefensive tackle: David Parry vs. Jalyn Holmes vs. Jaleel Johnson\r\nDespite losing\u00a0Tom Johnson\u00a0and\u00a0Shamar Stephen\u00a0in free agency, the Vikings upgraded the defensive line this offseason by adding\u00a0Sheldon Richardson\u00a0to\u00a0the mix. He'll partner with All-Pro nose tackle\u00a0Linval Joseph. Richardson will replace Johnson as the starting 3-technique while the competition to replace\u00a0Stephen, who was predominantly used as a spell for Joseph,\u00a0may include up to three players.\r\n\r\nDavid Parry was signed this offseason as an unrestricted free agent. The 6-2, 317-pound lineman proved in the first two years of his career (with the Indianapolis Colts) that he can be a disruptive force when healthy. But, will Parry be able to get his career back on track after an alcohol-related arrest in early 2017? He only appeared in one game for New Orleans last season.\r\n\r\nHis competition includes\u00a0Jalyn Holmes, a 2018 fourth-round pick, and Jaleel Johnson, a 2017 4th-round pick out of Iowa. Holmes, who played at THE Ohio State, will transition from defensive end to defensive tackle (3-technique) for the Vikings.\r\n\r\nJohnson will be Parry's main competition. Depending on how things shake out, Johnson could be in line for a dramatic increase in playing time a year after being stuck behind Tom Johnson and Shamar Stephen on the depth chart.\r\n2. Offensive line questions\r\nThe biggest question mark heading into the season is once again the offensive line. Last year the team's front office hushed critics by revamping the group in one offseason. This time around there's new questions facing the front five.\r\n\r\nJoe Berger and\u00a0Jeremiah Sirles\u00a0are no longer with the team, leaving two key voids to fill. The Vikings experimented by putting\u00a0Mike Remmers at right guard and\u00a0Rashod Hill\u00a0at right tackle during OTAs. The obvious question with this lineup is whether or not Hill, who had a 43.6 Pro Football Focus grade last season (the 68th-ranked tackle), is starting material.\r\n\r\nWould it make more sense to keep Remmers at right tackle and use a player like\u00a0Danny Isidora, Tom Compton,\u00a0Josh Andrews\u00a0or\u00a0Colby Gossett at right guard? Another possibility could be rookie tackle\u00a0Brian O'Neill\u00a0cracking the starting rotation. No matter who plays where, expect the Vikings offensive line to be held under a microscope throughout training camp and into the regular season.\r\n3. Dalvin Cook returns\r\nCook has all but fully returned from a torn ACL that he suffered last season. The running back was able to practice with the team during the final week of OTAs and all signs point to him being ready to put on the pads in Eagan.\r\nOTHER NOTABLE INJURIES\r\nPat Elflein (ankle) is still recovering from a broken ankle he suffered last season. He did not participate in spring OTAs or minicamp but is expected to be ready for training camp in late July.\r\n\r\nEverson Griffen (undisclosed) did not participate in the team's OTAs or minicamp. Griffen was reportedly dealing with a minor knee injury before OTAs so that could be the culprit. He's expected to be ready for training camp.\r\n\r\nAndrew Sendejo (calf)\u00a0was also a non-participant during OTAs and minicamp. At this point it's unclear if he will be ready for training camp.\u00a0Jayron Kearse,\u00a0Anthony Harris, or\u00a0Terence Newman would step in for Sendejo if he's unable to play.\r\n\r\nJalyn Holmes\u00a0(hand) broke his hand during OTAs and missed the team's mandatory minicamp. He's expected to be ready for training camp.\r\n4. Golden opportunities\r\nLinebacker\r\nWith linebacker\u00a0Kentrell Brothers\u00a0suspended for the first four games of 2018, there will be a chance for someone to step up in his absence.\u00a0Reshard Cliett,\u00a0Antwione Williams,\u00a0Eric Wilson,\u00a0Brett Taylor,\u00a0Devante Downs,\u00a0Garret Dooley\u00a0and\u00a0Mike Needham will be given the opportunity to\u00a0fill the void caused by Brothers' suspension,\u00a0or even win a spot on the roster outright.\r\nWide receiver\r\nThe same can be said for wide receiver\u00a0Cayleb Jones. Jones,\u00a0who could have become the WR4, instead will need to prove to coaches in training camp and the preseason that he deserves to be on the roster following cuts. His four-game suspension provides an opportunity for players like\u00a0Stacy Coley,\u00a0Brandon Zylstra,\u00a0Tavarres King,\u00a0Chad Beebe,\u00a0Korey Robertson,\u00a0Jake Wieneke\u00a0or\u00a0Jeff Badet to make\u00a0the squad.\r\n5. A shiny new offense\r\nShortly after he was hired, Vikings offensive coordinator\u00a0John DeFilippo told KFAN radio his offensive scheme included a balanced attack that utilized diversity among running backs and a strong offensive line to close out games.\u00a0He will also add RPO's (run-pass options) to the offensive repertoire\u00a0while scheming to get the ball into the hands of his playmakers early and often.\r\n\r\nDeFilippo inherited an offense that performed well (even\u00a0without a star quarterback) under former offensive coordinator\u00a0Pat Shurmur. Now, the new OC has Cousins\u00a0as his quarterback with\u00a0Cook,\u00a0Murray, Diggs,\u00a0Thielen,\u00a0Kyle Rudolph, and\u00a0David Morgan at his disposal.\u00a0If DeFilippo schemes to his player's strengths and, like Shurmur, takes pressure off the offensive line with clever play-calling, this could be a very entertaining offense to follow in 2018.\r\n6. Contract extensions looming?\r\nAlthough both players are signed through the 2018 season, Stefon Diggs\u00a0($1.9 million cap hit) and\u00a0Anthony Barr\u00a0($12.3 million cap hit) are next in line for new deals. Considering the recent extensions of\u00a0Danielle Hunter\u00a0and Eric Kendricks\u00a0as well as the Vikings' tendency to target training camp to strike deals, will the team follow suit and announce a new contract extension (or two) during this year's camp?\r\n\r\nAccording to the NFLPA\u00a0public salary cap report, the Vikings currently have $14.061 million in cap space.