Search on for Missing Ohio State Football Player

PHOTO: Kosta Karageorge appears in this undated photo from Ohio State Universitys athletic site.PlayOhio State Athletics Dept.
WATCH OSU Football Player Missing

An Ohio State football player hasn't been seen since going out for a walk late Tuesday night and his family and friends are concerned that something may be wrong.

Ohio State University football player Kosta Karageorge left his apartment about 2 a.m. Wednesday morning, according to his family. His sister Sophia told the Columbus Dispatch that his roommate said that he left to take a walk.

As of 6 p.m. ET today, a family member told ABC News that the search so far has yielded no clues to the college senior's whereabouts.

Karageorge, a defensive tackle who is also on the Ohio State wrestling team, had no vehicle, wallet or ID when he left, the sister told the newspaper.

"He had some extenuating circumstances that night that lead us to believe he was upset," she said.

The reserve defensive lineman didn't show up for football practice Thursday morning, ABC affiliate WSYX-TV in Columbus reported. The Buckeyes are set to play Michigan on Saturday.

Karageorge, 22, is a white male, 6 feet, 3 inches tall, and weighs about 270 pounds. He was last seen wearing black sweatpants over jeans, black Timberland boots, and a black hoodie with FOC on it.

"He never misses practice," Sophia told the Dispatch. "I've seen him go to wrestling practice with a broken foot. I've seen him sick as a dog go to practice. He's always on schedule. He always has somewhere where he checks in."

She said that Karageorge has a history of sports-related concussions and the family is worried that might be disoriented because of one he suffered a month ago.

Anyone with information about Karageorge's whereabouts can call 614-747-1729.

A call to the Columbus police about the case wasn't immediately returned.