The 28-year-old lefty began this season with the Mets, allowing eight runs on 16 hits and five walks in 10 innings over four appearances, including two starts.
Laffey spent last season with Toronto, posting a 4-6 record and 4.56 ERA in 100 2/3 innings. He started 11 games for Triple-A Las Vegas last year and went 3-5 with a 4.52 ERA.
Adam Berry is a reporter for MLB.com. Follow him on Twitter at @adamdberry. This story was not subject to the approval of Major League Baseball or its clubs.