The Dodgers selected Alfonzo's contract from Triple-A Oklahoma City on Saturday.
Alfonzo has thrived with OKC this season, slashing .313/.392/.422 with one home run, 16 RBI and a 22:17 BB:K over 49 games. He's thus getting his first look in the majors, and he's expected to serve as the backup behind the plate to Dalton Rushing while Will Smith (neck) remains on the IL. Chuckie Robinson, who had been working as the backup catcher, was optioned to Triple-A in a corresponding move.