Gary Sheffield was livid when he was informed that the Yankees planned to exercise his $13 million option, preferring instead to test the free-agent market in hopes of landing a final three-year deal before retiring. Although Sheffield has little recourse if the Yankees do deal him, by making his displeasure known, it is possible that the potential trade partners will become leery because they can't be sure how Sheffield will react to a deal. "I don't know what (the Yankees are) going to do," Sheffield told USA Today in a story posted on the paper's Web site late last night. "Maybe they picked it up just to trade me. If they do that, if I just (go) to a team for one year, there's going to be a problem. A big problem. I will not do this."