Manuel said that Bay looks "pretty good" before Sunday's game against the Philadelphia Phillies. The left fielder is beginning to resume non-baseball activities and will be evaluated by team doctors before advancing to the next level in his rehabilitation.
There is no timetable for Bay's return.
Bay was the Mets' big offseason acquisition, but he has struggled to a .259 average and just six homers. He sustained a concussion while slamming into a wall in Los Angeles on July 23. Bay played two games before having headaches on the flight home.