New York Jets defensive back Antonio Allen sustained a concussion during the team's preseason loss to the New York Giants on Friday, Jets coach Rex Ryan confirmed after the game.
Allen left the field with trainers with about 11 minutes left in the first half after a helmet-to-helmet collision with teammate Demario Davis. Allen had a tackle and a pass defended before exiting.
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It's unclear how much time Allen will miss. Per the NFL's concussion protocol, he must pass a neurological exam before he can return to practice.
"It's frustrating," cornerback Darrin Walls said to ESPN.com. "We already have enough corners down, but hopefully he'll be fine."
Cornerbacks Dexter McDougle and Dee Milliner have also sustained injuries. McDougle is out for the season after tearing his left ACL, and Milliner is questionable for Week 1 with a high left ankle sprain.
Those injuries elevated Allen and Walls to starting roles for the Giants game.
Allen in entering his third NFL season after the Jets selected him in the seventh round of the 2012 NFL draft. He started nine games for New York at safety last season, recording 60 combined tackles, one interception and one sack.
Peter King: When Browns' fans might see Manziel start this season
On Wednesday's SI Now, The MMQB editor-in-chief Peter King discusses the Cleveland Browns choosing to start Brian Hoyer over Johnny Manziel at quarterback and when fans might see Manziel start this season.
- Ben Estes