A key playmaker on the high-powered Oklahoma offense was carted off with an injury in the fourth quarter of the Big 12 championship on Saturday

Marquise “Hollywood” Brown suffered a lower-leg injury in the fourth quarter, and returned to the sidelines with a boot on his left leg. Brown has until Dec. 29 to rehab and heal the injury before the Sooners play Alabama.

In an interview with ESPN on Sunday, coach Lincoln Riley offered an update. The junior underwent some preliminary tests on Saturday and then some more Sunday morning.

“I don’t know yet,” Riley said, according to the Oklahoman newspaper.

“Going to meet with the doctors in the next couple of days and see where we’re at,” Riley said. “It was certainly a significant enough injury that there was no way he was going to be able to return in the game. The extent of that is a little bit unknown. But we’ve got a great medical team and we’ll fight hard to try and get him back.”

Brown is a potential 2019 first-round NFL draft pick, and leads Oklahoma and ranks fourth among Power Five players with 1,318 receiving yards. He has 75 catches and 10 touchdowns.

He had five catches for 54 yards in the 39-27 win over Texas on Saturday.