John Michael McGee's tenure at Oklahoma appears to be over. The true freshman guard tweeted Monday afternoon that he was leaving the team.

“Goodluck to OU on the field I'll be watching,” McGee posted on his Twitter account. “It's just not for me.”

Bob Stoops said he gave McGee the day away from the team to contemplate whether he wanted to go ahead and leave.

His departure is another blow to an offensive line that’s been ravaged by injuries this season. Monday, Stoops confirmed that three-year starting guard Tyler Evans has suffered a knee injury and was undergoing an MRI. Stoops feared that it could be a torn ligament. Last week, Stoops announced that veteran center Ben Habern was giving up football because of a bad neck and back.

OU is also without guard/center Nila Kasitati, who underwent a procedure on his heart last week. The ailment is believed to be non-life threatening and offensive line coach James Patton said he’s hoping to get Kasitati back on the practice field in the next few days. Reserve center Austin Woods is still undergoing chemotherapy treatments even as he practices with the team. Woods was diagnosed with Hodgkin's lymphoma in the spring.

McGee was the No. 12 guard in the country coming out of Texarkana, Texas, according to ESPN. He signed with the Sooners despite having offers from Michigan, Notre Dame and Alabama, among others.

“John Michael McGee is a freak athletically,” Patton said of him in the spring. “He’s not as big as (former OU All-American) Trent Williams, but in terms of a linemen who can move and bend and has quickness and agility – we saw him on tape and they threw a tackle screen to him and he walked in for a touchdown. In terms of his athleticism, he can do a lot of different things for us.”