Adam Gase openly second-guessed himself Sunday for leaving Le'Veon Bell in the game after he injured his hamstring.

The coach and running back were also involved in an injury dispute during training camp.

"I'm mad at myself that I let him go back in there in the second half," Gase said. The New York Jets lost 27-17 to the Buffalo Bills.

Bell was hurt late in the second quarter when he fell awkwardly. He returned in the second half, his hamstring wrapped. He stayed in for five plays before it became apparent that he had no burst.

"That play looked bad," Gase of the second-quarter play in which Bell appeared to pull up. "I'm watching, and I thought it was going to be a touchdown, then he got grabbed. And kind of the way he planted and torqued, it looked really bad.

"I saw him grab his hamstring and he wouldn't come out. We come in at halftime. I let him go back in there. I was worried about it, and we were eventually like, 'I can't put you in there. We can't take a chance on getting more hurt than you already are.'"