New York Giants wide receiver Calvin Austin III suffered a "serious" injury to his right knee while running a route at Tuesday's training camp practice, a source told ESPN's Adam Schefter. Austin crumpled to the ground during a one-on-one drill while running step for step with cornerback Deonte Banks. He immediately grabbed his right knee as the practice field went quiet.

The Giants trainers quickly called for a cart. Austin's teammates all came over, including those on the other side of the field, to wish their teammate well before he was carted off. The quarterbacks, wide receivers and defensive backs huddled in a circle to say a lengthy prayer. Giants owner John Mara even went over to console Austin on the side field before he was taken away for further evaluation.

Austin is set to undergo an MRI to determine the exact nature of the damage. There wasn't much optimism Tuesday afternoon. Austin was signed by the Giants to a one-year deal this offseason as a free agent. He was going to play a significant role as their slot receiver.

"It would be a blow," offensive coordinator Matt Nagy said. Braxton Berrios served as the slot receiver with the first-team offense in Austin's absence. If the injury turns out to be severe, it could also open the door for veteran Odell Beckham Jr. Austin, 27, had 31 catches for 372 yards with three touchdowns last season.