The Detroit Lions are about 24 hours from the official start of the league year and while the franchise has not made any big moves in the pre-free agency period, they do have holes to fill on their roster.

While the largest gaps are on defense, the Lions have many areas that need upgrades – so here’s a look at what the Lions offense looks like heading into free agency.

Quarterback: Starter – Matthew Stafford. Backups – Dan Orlovsky; Kellen Moore.

Thoughts: The Lions aren’t making any more moves here. If they add another quarterback, it will be during the draft or a UDFA.

Running back: Starter – Joique Bell. Backups – Theo Riddick; George Winn; Emil Igwenagu (FB).

Thoughts: The Lions might make a move here – C.J. Spiller is a rumored target – but between the draft and free agency, Detroit will add at least one more running back and maybe two. Stevan Ridley could be a cheap candidate coming off injury, although he doesn’t have the return capability of Spiller.

Wide receiver: Starters – Calvin Johnson, Golden Tate. Backups –Ryan Broyles; TJ Jones; Jeremy Ross; Corey Fuller; Skye Dawson; Andrew Peacock.

Thoughts: The need for a true third receiver – and possibly a returner – is high. This seems like a more likely solution in the draft, where there will be plenty of options for younger players with fresher legs.

Tight end: Starter – TBD. Candidates to start – Brandon Pettigrew, Eric Ebron, Joseph Fauria. Backup – Jordan Thompson.

Thoughts: No need to draft or sign a free agent here. The Lions will roll with the investments they have unless someone gets hurt. Next year could be a big season for movement as Pettigrew won’t have guarantees on his contract and Fauria is a restricted free agent.

Offensive tackle: Starters –Riley Reiff (LT); LaAdrian Waddle (RT). Backups – Cornelius Lucas, Michael Williams.

Thoughts: There could easily be an addition here through free agency – or more likely the draft. This would give the Lions flexibility to move Reiff if they want. A cheap veteran could be the move as well, but a player like Cameron Erving in the draft would be very intriguing to Detroit. Watch the development of Williams, too.

Interior linemen: Starters – TBD (LG); Travis Swanson (C); Larry Warford (RG). Backups – Rodney Austin, Taylor Boggs, Darren Keyton, Braxston Cave.

Thoughts: The Lions need to make a veteran free agent signing here, be it the return of Rob Sims or another player on the market. The Lions need a veteran on the line to offer some experience since right now Reiff would be the most-tenured NFL lineman the Lions have. This is where a Sims re-signing coupled with a high-to-mid level draft pick would make sense. Clint Boling could be an intriguing choice here since he’s young (25) and graded out pretty well by Pro Football Focus as a run blocker.