Mets reliever Jim Henderson is now suffering from a hamstring issue and will need to restart his rehab, NY Post reporter Mike Puma said on Twitter.
Henderson was first put on the 15-Day disabled list June 19 with right biceps tendinitis.
In 31 appearances for the Mets this season, he was 1-2 with a 4.26 ERA, while striking out 30 batters in 21 innings.
Henderson received a non-roster invitee to spring training from the Mets, then made their Opening Day roster. Prior to this year, his last full big-league season was in 2013, when he saved 28 of 32 opportunities, after which he needed multiple shoulder surgeries and missed 23 months.