EAST RUTHERFORD — Jets quarterback Justin Fields was in the concussion protocol after leaving in the fourth quarter of a 30-10 loss to the Buffalo Bills on Sunday.

Fields fell backward when he was sacked by Joey Bosa and the back of his helmet hit off the turf. He was down for a few moments before he was able to get up and walk off under his own power.

He was checked out in the injury tent on the Jets’ sideline and emerged several minutes later with a towel over his head. The quarterback then walked inside to the locker room.

Tyrod Taylor replaced Fields with 12:03 remaining in the game and the Jets losing 30-3.

It’s uncertain if Fields will be ready to play in the next game for the Jets (0-2), still looking for their first win under Aaron Glenn, at Tampa Bay next Sunday.

“Still have

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