NEW YORK — Yankees closer Luke Weaver described the source of his hamstring injury as a little bit of a jump, a grab that came out of nowhere as he stretched in the bullpen during Sunday night’s win over the Dodgers.

Luke Weaver injured his hamstring preparing for Sunday's game against the Los Angeles Dodgers, potentially costing the New York Yankees their star closer for over a month.

New York Yankees closer Luke Weaver is expected be placed on the injured list after injuring his hamstring warming up Sunday night, sources tell ESPN. Weaver underwent an MRI and could miss four to six weeks, though the official timetable will be determined Tuesday.