Workman was optioned to Triple-A El Paso on Sunday.
Workman is the odd man out with the big-league club after the Padres signed Austin Hays to a major-league contract Sunday. Workman had been with the major-league roster since Tuesday, going 1-for-3 with a double and three RBI in limited action over two contests. The 26-year-old has the ability to play all over the diamond, so he will be a top candidate to return to the Padres' roster if anyone goes down with an injury.