Triple-A Syracuse reinstated Gilbert (hamstring) from its 7-day injured list Tuesday.

Gilbert (hamstring) began a rehab assignment Thursday with the Florida Complex League Mets.

The Mets aren't expecting Gilbert (hamstring) to return from Triple-A Syracuse's 7-day injured list until the second half of June, Will Sammon of The Athletic reports.

Gilbert remains without a clear timeline for his return from a hamstring strain, but the Mets are hoping he'll be back in the lineup for Triple-A Syracuse by late May or early June, Anthony DiComo of MLB.com reports.

Gilbert was placed on the 7-day injured list at Triple-A Syracuse on Sunday due to a mild right hamstring strain, Anthony DiComo of MLB.com reports.