Training camp opened less than a week ago, and the Indianapolis Colts are suddenly short on running backs.

Zack Moss suffered a broken bone in his forearm during Monday's practice and will undergo surgery.

The recovery time is expected to be six weeks, which means he'll miss the rest of training camp and puts his availability for the Colts' Week 1 opener against the Jacksonville Jaguars on September 10 into question.

Moss had been working as the Colts' No. 1 running back in training camp with Jonathan Taylor absent.

Taylor, who was the NFL's rushing leader in 2021, has been seeking a contract extension, prompting him to request a trade.

He is currently on the physically unable to perform list, but the Colts are considering moving him to the non-football injury list after it was reported he failed his physical due to a back injury that was sustained while away from the Colts. He is also working his way back from an ankle injury that forced him to miss six games last season.

Last November with Taylor injured, the Colts traded for Moss from the Buffalo Bills, and in the season's final four games, he rushed for 334 yards on 69 carries with one touchdown while averaging 4.8 yards per attempt.

With Moss injured and Taylor clashing with owner Jim Irsay and the front office, Deon Jackson and rookie Evan Hull are next men up at running back for Indianapolis.