A missing Ohio State University football player vanished after he sent his mother a mystery text blaming concussions for mood changes.

"I am sorry if I am an embarrassment but these concussions have my head all [expletive] up," Kosta Karageorge, 22, texted his mother at 1:30 a.m. Wednesday.

Thirty minutes later he was seen walking out of his apartment in Columbus. He hasn’t been seen since. The disappearance means Karageorge will miss Ohio State's bigget game of the year Saturday against Michigan.

Susan Karageorge reported her son missing Wednesday evening after he failed to show up at practice.

The Columbus Dispatch reported Saturday that Karageorge has a history of sports-related concussions according to his sister. Sophia Karageorge told the newspaper the family is worried a concussion her brother suffered a month ago might have left him disoriented.

"I'm very scared for him," Karageorge's high school wrestling coach Jeremiah Webber told the paper. "I'm worried. I'm trying to remain optimistic. We love him and want him home."

Team physician Dr. Jim Borchers said in a statement that he while he could not comment on Karageorge's medical care, "We are confident in our medical procedures and policies to return athletes to participation following injury or illness."