OAKLAND -- It may officially be a lost season for Clint Frazier.
The young, highly touted outfielder suffered yet another setback in his post-concussion migraine rehab and it's "unlikely," Yankees manager Aaron Boone said, that Frazier will return to the majors in September.
Frazier, who turns 24 years old Thursday, saw a neurologist in Pittsburgh this week when symptoms started back up, Boone said.
"As he was getting ready to get transferred to (Double-A) Trenton," Boon said, "he started feeling symptoms, so he went up there and saw this guy and trying to really hone in and get the best program in place we can for him to start getting him on the right track for good.