Mets manager Jerry Manuel said that if there is no meaningful improvement in Jason Bay's condition by Friday, at the latest, the leftfielder could wind up on the 15-day disabled list.

Bay, who was diagnosed with a mild concussion after crashing into the wall at Dodger Stadium Friday while trying to make a catch, told Manuel that he didn't feel much better than he had on Tuesday -- the day doctors first diagnosed the concussion.

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The manager said the team would wait 48 to 72 hours from the time of the diagnosis to see if Bay would improve.

"If there is nothing in terms of progress, we'll make a decision to put him on the DL," Manuel said before the Mets' game against the Cardinals Wednesday.