Jason Giambi hobbled out of Yankee Stadium in the bottom of the seventh inning last night, wearing camouflage pants, a dark T-shirt and a black walking boot on his injured left foot. He was very willing to discuss his foot problems, but not so willing to discuss his other problems. On Wednesday, Commissioner Bud Selig requested that within two weeks Giambi cooperate with the investigation into steroid use in baseball by the former Senator George J. Mitchell. Selig?s request came after Giambi?s tacit admission to USA Today that he had used steroids. While Giambi acknowledged that he has spoken with his agent, Arn Tellem, about Selig?s request, he said they needed to have additional talks. He would not elaborate on his discussions with Tellem. ?I?ll just deal with what I can deal with,? Giambi said. ?Like I said, I?ve been in contact. There?s really not much to talk about until then. I?ll definitely let you guys know. I have no problem with that.?