Jerome Harrison is “progressing” in his recovery from brain surgery. (Hannah Foslien/Getty Images)

Eagles team doctors discovered a brain tumor that voided the trade but led to the necessary surgery to protect further damage to the running back’s brain.

Tuesday the Lions announced Harrison’s hope for a return to the field will have to wait until at least the 2013 season. Detroit placed the 29-year-old on the reserve/non-football illness list, per the team’s official Web site, ending his 2012 season.

Harrison’s agent, Mitch Frankel, told team reporter Tim Twentyman that his client is “progressing” in his ongoing recovery.

The roster move makes Harrison ineligible to particupate during the 2012 regular season and postseason and opens up a spot on Detroit’s 90-man roster.

Harrison played four games in 2011, rushing for 41 yards on 14 carries. He is three years removed from his career year with the Browns in 2009 when he rushed for 862 yards and five touchdowns.

(H/T Pro Football Talk)

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Jerome Harrison has a brain tumor