According to ESPN’s Buster Olney:
Joe Bick also represents Marcus Giles, who last played in the majors in 2007, and he says that the second baseman, 30, absolutely is not retired. "He wants to come back and play," Bick said. "I could not be more thrilled with what he’s done over the course of the summer [to re-start his career]…He’s going to set a goal of making an All-Star team." Bick said he’s already had some conversations with some teams.
We haven’t heard much about Giles since April, when he almost signed with the Dodgers. He may have to spend some time in the minors, as he hasn’t put up tolerable numbers since ’06. He’s also not much with the glove, and the free agent market for second basemen is decent.