Detroit Lions running back Jerome Harrison was scheduled to undergo surgery Friday afternoon for a brain tumor.
The tumor was discovered during a physical after Harrison had been traded from Detroit to Philadelphia earlier this week for Ronnie Brown. The trade was rescinded.
The Detroit Free Press reported that Harrison had been experiencing headaches with the Lions, at times wearing sunglasses fitted with a visor on the field, according to teammates.
Comcast SportsNet Philadelphia reported that the team physician for the Eagles ordered an MRI exam when Harrison told him he was experiencing headaches.
The Lions placed Harrison on the reserve/non-football illness list Friday.