Hall of Fame catcher Gary Carter was diagnosed with four small brain tumors, according to the New York Daily News.
He will have surgery at Duke University Hospital within the next few days, the paper reported.
According to the Daily News, a source close to Carter, 57, said he had been complaining of headaches and forgetfulness recently. It was an MRI on Saturday that revealed the tumors.
It won't be known until the surgery whether the tumors are benign or malignant, according to the paper.
Carter -- the catcher for the World Series champion 1986 Mets -- spent 19 years with the Mets, Expos, Giants and Dodgers. He hit .262 with 324 career home runs and 1,225 RBIs.
He has been managing at Palm Beach Atlantic College this past year, near his home in Palm Beach, Fla.