Calgary Stampeders star running back Jon Cornish suffered a concussion in the first half of Saturday's 18-13 loss to the Winnipeg Blue Bombers.

The CFL's Most Outstanding Player in 2013 bounced his head off the turf when he was tackled on a nine-yard run midway through the second quarter.

He staggered upon getting to his feet and required assistance to get off the field. Cornish walked unaided to the Stampeder clubhouse surrounded by medical staff and did not return to the game.

Following the game, Cornish said he thinks he will be fine but will go through concussion protocol this week.

Cornish missed six games in July and August with concussion symptoms after he was knocked out in the season-opener. He was appearing in just his ninth game this season Saturday after sitting out two other games with injuries, yet Cornish leads the CFL in rushing with 1,082 yards.