Simmons will undergo thumb surgery and subsequently land on the disabled list, Alden Gonzalez of MLB.com reports.

EDGE Analysis

What was initially believed to be a wrist injury was clarified as a sprained left thumb in the aftermath of Sunday's game. However, after Monday's MRI, it was revealed that Simmons is dealing with a "full thickness tear of the ulnar collateral ligament of his left thumb." With a lengthy DL stint expected, Cliff Pennington is in line for extended run at shortstop, with occasional nods from Johnny Giavotella.