Maybin announced his retirement from baseball via his personal Twitter account Monday.
Maybin cleared waivers and was outrighted to Triple-A Syracuse on Thursday, Tim Healey of Newsday reports.
The Mets designated Maybin for assignment Monday.
Maybin's contract was selected by the Mets on Wednesday, Justin Toscano of The Bergen Record reports.
Maybin was traded from the Cubs to the Mets on Tuesday in exchange for cash considerations, Bob Nightengale of USA Today reports.
Maybin re-signed Sunday with the Cubs on a minor-league deal and will report to the team's alternate training site, Tim Stebbins of NBC Sports Chicago reports.
Maybin was granted his release by the Cubs Saturday, Jordan Bastian of MLB.com reports.
Maybin officially joined camp Thursday and will compete for a reserve role with the Cubs, Jordan Bastian of MLB.com reports.
Maybin signed a minor-league contract with the Cubs as a non-roster invitee Friday, Jon Morosi of MLB Network reports.
Maybin went 2-for-4 with two doubles and a stolen base Wednesday but the Cubs fell to the Pirates 2-1.