The Miami Dolphins organization, coaches and fans are holding their collective breaths after running back Jay Ajayi left practice.

Ajayi is being evaluated for a concussion and was unable to finish practice on Monday, the Dolphins’ first in full pads, as first reported by Miami Heralds’ Armando Salguero.

The team will not have a confirmed diagnosis on Ajayi until later this afternoon, according to Dolphins head coach Adam Gase.

Ajayi had a heavy workload in Monday’s practice and was on the receiving end of many hits, including a hard decleater courtesy of Dolphins’ safety TJ McDonald.

“You’re not going to win either way,” Gase said (h/t ESPN’s James Walker).

“If you don’t go live, you’re going to dread that you don’t work on tackling. If you go live and somebody gets hurt, you going to say you shouldn’t. It doesn’t matter. You’re going to be wrong either way. We feel like that’s best for our football team. We need to go live and tackle. That’s football.”

The Dolphins plan to lean on Ajayi heavily this upcoming season after a breakout campaign in 2016.

Leading up to his departure Ajayi was being used prominently in the offense, including out of the backfield as a receiver.

“Jay will be back sooner rather than later,” Dolphins running back Kenyan Drake predicted.