GOODYEAR, Ariz. -- The Indians sent two players to the Padres on Wednesday.

Right-handed reliever Ed Mujica, out of options and out of the mix for the Tribe's bullpen, was traded for a player to be named or cash. And right-hander Jae Kuk Ryu, acquired from the Padres in a waiver claim last week, was sent back to his old club because Major League Baseball voided the transaction.

The Indians were mum on what happened with Ryu, but it's possible that the claim was voided because of a medical issue or a technicality. Ryu, who had been assigned to the Tribe's Minor League camp, had arthroscopic surgery performed on his elbow last July, when he was in the Rays' organization.

As for Mujica, he had pitched against the Padres on Monday night in an audition, of sorts. The 24-year-old Mujica has an 8.10 ERA in nine Cactus appearances, though he has improved a bit recently.

Mujica, a native of Venezuela, has a live fastball that he's never really been able to get consistent results with at the Major League level. In 33 career appearances with the Tribe, he went 3-3 with a 6.04 ERA. He has a career 3.35 ERA in the Minors, with just 60 walks in 231 1/3 innings.

With Mujica and Ryu out of the picture, the Tribe's 40-man roster now stands at 38.

Also Wednesday, the Indians, as expected, reassigned right-hander Vinnie Chulk to Minor League camp. Chulk was the runner-up in the battle for the club's last bullpen spot. The veteran will report to Triple-A Columbus and has an out clause in his contract that allows him to become a free agent if the Indians don't promote him by May 15.