Choi was called up from Triple-A after Friday's game, the Los Angeles Times' Pedro Moura reports.
C.J. Cron suffered a broken hand in Friday's game and was placed on the DL, so Choi will presumably step in and start seeing fairly regular playing time at first base and DH. Choi hit .329/.413/.488 with four home runs in 44 games at Triple-A, but only hit .056 in 24 plate appearances in the big leagues earlier this year.