AP

Arian Foster hasn’t been a Dolphin long, but he’s going to get plenty of work during camp.

According to Armando Salguero of the Miami Herald, Dolphins running back Jay Ajayi is being held out of practice today because of a knee injury. There’s no word yet on the severity of the problem, but Ajayi’s own history will make people raise their eyebrows.

He had knee problems in college, and there were rumors of concern before he was drafted. But while those might have been overblown during the pre-draft lying season, it will become a reference point now.

The Dolphins are curious about how the position will develop, as they hoped to use both Foster and Ajayi. But there are legitimate concerns about how much they’ll be able to stay on the field, so it might take care of itself over time.