Sources: Mets' Robert Gsellman heading to IL with lat injuryGsellman will out be 6-8 weeks after tearing the muscle6/21/2021, 5:22 PMAndy MartinoMLB InsiderAug 17, 2020; Miami, Florida, USA; New York Mets relief pitcher Robert Gsellman (65) delivers a pitch in the first inning against the Miami Marlins at Marlins Park. / Jasen Vinlove-USA TODAY Sports