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The Jacksonville Jaguars don’t have an official diagnosis for running back Maurice Jones-Drew’s foot injury yet. But they’re concerned it could be something very serious.

Jaguars coach Mike Mularkey acknowledged at his press conference today that a Lisfranc injury is a possibility. The Lisfranc injury usually keeps a player out at least a few months, which would make it a season-ending injury at this point in the season.

That’s the worst-case scenario, and it’s possible that further examination will reveal a less serious injury. But there’s real concern in Jacksonville that a bad season is about to get a lot worse with the loss of the Jaguars’ best player.

Jones-Drew, who led the league in rushing last season, held out of training camp this season in the hopes of getting a new contract — which the Jaguars refused to discuss. This year he ranks 18th in the league with 414 rushing yards, and he might not gain any more.