Los Angeles Angelscenter fielderMike Trout, thereigning American League MVP, is headed to the disabled list for the first time in his career and will have surgery Wednesday to repair the UCL in his left thumb.
The typical timetable for return is six to eight weeks.
Scioscia added that Trout's loss will be felt beyond his abilities on the field.
"Any time a guy is hurt, there's a ripple effect," Scioscia said. "We lose a guy like Mike, the way he plays his game, the way he plays with passion, his presence on the field is huge, his presence in the clubhouse is huge. But we have to be more than one guy, and I think we are."
The Angels lost shortstop Andrelton Simmons to a similar thumb injury last season. He had surgery and was out slightly over five weeks.
Trout jammed his thumb into the base and yelled in pain as he rose from the ground. He was examined by a trainer and stayed in the game but was replaced in the sixth.
Trout went 0-for-2 on Sunday and is batting .337, the second-highest average in the AL. He has 16 home runs -- second to New York Yankees rookieAaron Judgefor the major league lead -- and is fourth in the AL with 36 RBIs.
Information from ESPN's Stats & Information and The Associated Press was used in this report.