The Dallas Cowboys released left guard Larry Allen on Tuesday, likely cutting ties to one of the most dominant offensive linemen in NFL history. Allen, the final player left from Dallas' most recent Super Bowl team, is going into his 13th season. No longer the steamrolling blocker he once was, Allen was due a $2 million roster bonus April 1. The move also saves Dallas about $3.5 million toward next season's salary cap. "This decision is a tough one for me personally,'' Cowboys owner Jerry Jones said in a statement. "Larry has been the best in pro football for a long time. His ability and performance set a standard for excellence at his position in the NFL for many years, and we are grateful for his contributions to the Dallas Cowboys.'' Dallas could still re-sign the 34-year-old Allen, with Jones even saying the club has "made it clear that the door is open for ... a return to the Cowboys.'' But as a free agent, he can go anywhere he chooses. Allen's agent, Marvin Demoff, did not immediately return a call to The Associated Press seeking comment.