The Indianapolis Colts are unsure if they'll bring back Trent Richardson next season.

Richardson, whom the Colts acquired from Cleveland in September 2013, had weight issues during the season, was difficult to get in touch with and didn't tell the team he wouldn't be at the walk-through the day before the AFC Championship Game, a source said.

Richardson gained 15 pounds during the season, going up from 225 to 240 pounds.

Because of default language in his contract, the Colts could exercise an option to void $3.1 million in guaranteed money owed to Richardson next season. The NFL Players Association would likely challenge that ruling if it occurs.