Alvarez will get surgery Tuesday for the torn UCL in his left thumb and expects to miss 6-to-8 weeks, Tim Healey of Newsday reports.
Alvarez sustained the thumb injury during Friday's game against the Dodgers after stumbling on his turn toward second base. He started the season slashing .236/.288/.364 with one home run and eight RBI over 59 plate appearances. Omar Narvaez and Tomas Nido will handle the catching duties while Alvarez is sidelined.