After reportedly admitting to a federal grand jury that he knowingly used steroids, Jason Giambi's 2005 season was off to an inauspicious start. In the midst of an 0-for-15 slump in May, he was asked if he would consider a demotion to the minor leagues. He had lost endorsement deals with Pepsi and Arm & Hammer. But Giambi eventually pulled through. His 32 home runs and 87 RBI in 139 games this season recently earned him the American League's Comeback Player of Year in a voting by fans. On Thursday, Reebok announced that it had signed the New York Yankees slugger. Terms of the deal, which includes both shoes and batting gloves, were not disclosed. "We are excited to have Jason Giambi join our family," said John Lynch, Reebok's vice president of sports marketing. "Being named this year's American League Comeback Player of the Year is a true testament to Jason's determination and work ethic."