ARLINGTON, Texas -- Dallas Cowboys wide receiver Michael Gallup likely suffered a torn ACL in his left knee in the second quarter of Sunday's 25-22 loss to the Arizona Cardinals, according to owner and general manager Jerry Jones.
Jones said Gallup will undergo an MRI on Monday to confirm the extent of the injury.
The receiver left AT&T Stadium on crutches. After the game, a team spokesman said Gallup suffered a serious sprain to his knee.
Gallup's left knee appeared to buckle as he turned to catch a 21-yard touchdown pass from Dak Prescott in the second quarter. He clutched his knee after the officials ruled the catch was good. He was able to walk off the field but went immediately to the medical tent for further evaluation.
"It was tough, very tough," Prescott said. "Coming in at halftime and going to see him, just unfortunate. A guy that I love. Can't get a better teammate than MG. Sick about it."
Gallup is scheduled to be an unrestricted free agent after the season.
"Feel terrible for Michael," coach Mike McCarthy said. "Obviously made a huge play, but you could see just the way he came down."
Gallup suffered a calf injury in the season-opening loss to the Tampa Bay Buccaneers and missed seven games. He had 32 receptions for 409 yards and a touchdown entering Sunday and caught three passes for 36 yards and a touchdown against Arizona.
With Gallup out, the Cowboys moved Cedrick Wilson into the No. 3 receiver role opposite Amari Cooper and CeeDee Lamb. Wilson finished with six catches for 35 yards and a touchdown. He also threw a 31-yard pass to Tony Pollard.
"That's like my brother, off the field, one of my closest friends, we hang out all the time," Wilson said of Gallup. "To see him go down like that -- I'm just praying it's not as bad as they think it is. I know him, just have to help him like he helped me when I was down, injured, he helped me through it. It's my job to help him."