According to the official Week 1 injury report, the Dolphins running back is a healthy scratch for Sunday's game against the Seattle Seahawks.
Specific details surrounding Ajayi's situation are scarce, but NFL Network's Mike Garafolo reported that Ajayi didn't respond well to the challenge Arian Foster's arrival presented, and instead sulked through the preseason.
The Miami Herald's Adam Beasley reported that an unnamed Dolphins player said this week the running back was upset over his recent demotion behind Foster on the depth chart.
"If you let it get the best of you, it shows," the player told Beasley.
Ajayi entered the offseason as the presumed top back in Miami, but was quickly passed once Foster signed. Ajayi did not impress this preseason, yet was expected to retain a role in the offense given Foster's age and injury history.
Center Mike Pouncey is also not playing while still nursing a hip injury.
