Several teams have dealt with a lack of depth at positions, and since the end of the 2015 season have tried to address them with transfers, signing day and position changes. Some of the moves have eased concerns, but others linger and may be around beyond this season.

Here are several position groups that will draw attention throughout the summer:

Tennessee defensive tackles

There aren’t many questions about Tennessee’s defense right now, but one is at defensive tackle where the Volunteers have Kahlil McKenzie, Shy Tuttle, Alexis Johnson, Danny O’Brien, Kendal Vickers and Quay Picou.

“Depth at the D-tackle is a little bit of a concern,” defensive coordinator Bob Shoop told the Times Free-Press. “Kahlil and Shy and Danny O’Brien (and Vickers) are guys that have played a lot for us inside. Behind them, we need to continue to develop some of those guys.”

Among the questions the team has dealt with recently were assault accusations against Johnson where charges have been dropped or reduced, and Tuttle’s recovery from a broken fibula and torn ankle ligaments he suffered in October.

LSU linebackers

Overshadowed somewhat by the return of Kendell Beckwith, LSU has some need at linebacker, especially after one-time commit Erick Fowler flipped to Texas and LSU didn’t sign a linebacker in the 2015 class. What’s more, only one of two linebackers signed in 2014 remain on the team. Beckwith, Devin Voorhies and Duke Riley all return at linebacker, but Beckwith and Riley are seniors, so this issue could linger for a while.

As the Advocate noted in February: “It’s a slim position group, and LSU adds just two linebackers from the 2016 class – only one of them a mid-year enrollee,” Ross Dellenger wrote. “… LSU’s rotation will, of course, depend on new DC Dave Aranda’s scheme. Will the Tigers play four linebackers? Will they often move guys like Arden Key and Isaiah Washington from defensive end to linebacker?”

Georgia offensive tackles

Georgia has at least six players who fit into the offensive tackle mold, yet despite Isaiah Wynn, Pat Allen, Sage Hardin, Kendall Baker, Aulden Bynum, Ben Cleveland or even Greg Pyke, the Georgia coaching staff is looking for more.

“I think when you go to the offensive line, it’s not exactly what we want,” coach Kirby Smart told 247Sports in February. “We want some offensive tackles. If you say what’s the number one need going into 2017? It’s offensive tackles is what we need. That’s the most deficient area on our front. I think if you combed the country and asked every SEC coach, he’s going to say we’re most deficient at offensive tackle.”

That’s why Georgia added Tyler Catalina, a graduate transfer from Rhode Island who can play immediately. Combine Smart’s comments with the addition of new offensive line coach Sam Pittman and his philosophy of having bigger linemen, and a transition is in store for the Georgia offensive line.

Missouri quarterbacks

The fallout from Maty Mauk’s January dismissal left the Tigers with Drew Lock and Marvin Zanders as the only scholarship quarterbacks on the roster. Then Barry Odom added signee Micah Wilson and junior college transfer Jack Lowary in February, but following the transfer of former backup quarterback Eddie Printz, the Tigers are thin in age and experience behind center.

Odom said after the Black and Gold game that the QB competition would continue into the summer. Lock started the final eight games of last season, and was 9-for-13 for 134 yards and two touchdowns in the spring game. Zanders was 8-for-13 for 83 yards and a TD, but the redshirt sophomore still hasn’t attempted a pass in a live game.

South Carolina wide receivers

All you need to know about the Gamecocks’ concerns at wide receiver is that the post-spring depth chart didn’t even list a player behind Jamari Smith — and he recently moved from running back.

Among the candidates to contribute are Deebo Samuel, who caught just 12 passes last season, Bryan Edwards and Matrick Belton, the only other returning receiver who caught more than five passes last season.

Injuries short-circuited Samuel last season, but he finished the regular season with four catches for 104 yards and a touchdown against Clemson. Continuity is something not only the position group is looking for, but Smith himself after he’s also played cornerback twice along with running back.

There’s also walk-on Devin Dingle, who had two catches for 77 yards in the spring game.