Atlanta Falcons cornerback Asante Samuel exited last night’s preseason game after suffering a thigh injury, according to D. Orlando Ledbetter of the Atlanta Journal-Constitution.

At the time of his injury, Samuel was questionable to return. He was replaced by second-round draft pick Robert Alford.

Beyond his early exit, little is known of Samuel’s injury. The Falcons, who open the regular season in two weeks, are likely to proceed cautiously with Samuel no matter the extent of the injury, but it’s not clear if it will threaten his availability for Week 1.

What is clear is Samuel’s importance to the Falcons. He appeared in 15 games for the team last season, intercepting five passes over that span. He’s been one of the top cornerbacks in the NFL over his career, and he’s specifically known for his ability to make plays.

Alford is listed as the Falcons’ top backup for Samuel, but the rookie struggled mightily after replacing him last night. He got beat for three touchdown passes and was called for a penalty that wasn’t accepted because he gave up a 56-yard gain on the play. He did collect one interception, but he missed an opportunity for another.