Wales winger John Oster is training with Derby following his release by Championship rivals Reading.
The 29-year-old is without a club after leaving the Madejski Stadium when his contract expired at the end of last season.
Ironically, Oster's final game for Reading was against Derby at Pride Park as the Royals were relegated from the Premier League.
Former Everton and Sunderland midfielder Oster has made 301 career appearances scoring 24 goals.