DETROIT — ESPN is reporting that Detroit Lions running back Jerome Harrison has a brain tumor.

The network cited two NFL sources it did not identify in Thursday’s report. It says the tumor was revealed when Harrison had a physical after being dealt this week by Detroit to the Philadelphia Eagles in a trade that was voided by the discovery.

Lions coach Jim Schwartz wouldn’t confirm or deny the report, citing a privacy issue. He said Harrison was back on the team’s 53-man roster.

The Lions wanted to trade Harrison to Philadelphia for Ronnie Brown and a draft pick. Detroit needs help because Jahvid Best had his third concussion.