The A's have sent starter Chad Gaudin to the bullpen in order to make room for returning pitcher Rich Harden, according to the Associated Press. Harden is expected to come off the disabled list for Oakland on Sunday. Gaudin is 3-2 with a 3.75 ERA in six starts for the team this season and could become trade bait if Harden stays healthy. "It was a very difficult decision with all of our starters throwing well," Manager Bob Geren said Wednesday. "The bullpen will be one of our strengths and a deeper one with him. ... When you have five starters throwing well and one of them is not going to start, I don't expect him to be happy about it."