Nationals activate Drew Storen
Storen, who had 43 saves last season, had surgery in April to remove bone chips from his right elbow and hasn't pitched this season.
Ankiel, who turned 33 on Thursday, batted .228 with five home runs and 15 RBIs.
Washington has eight pitchers in the bullpen and four position players on the bench after the moves.
Copyright 2012 by The Associated Press
MORE MLB HEADLINES
- Nats' Werth to serve 5 days for driving 105
- Minaya leaves Padres to be MLBPA adviser
- McCain: Time to talk legalizing sports betting
- Pearce, O's agree to $3.7M, 1-year contract