In a corresponding roster move, the Marlins have optioned right-hander Ryan Webb to Triple-A.
Mujica has been on the DL since June 30 with a fractured bone in his right pinky toe. He sustained the injury when he was hit by a comebacker off the bat of Philadelphia Phillies third baseman Placido Polanco.
Prior to hitting the DL, Mujica, 28, had maintained an ERA and WHIP of 4.46 and 1.223 with 4.7 SO/9 and 2.4 BB/9 over his 35 appearances for the Marlins.
Webb has appeared in 38 games for Miami this season. Over his 36 innings pitched, the 26-year-old has posted an ERA and WHIP of 5.50 and 1.361 with 6.5 SO/9 and 2.3 BB/9.