Castro-Fields (knee) was taking part in team drills during Tuesday's OTAs, Zach Selby of the Commanders' official site reports.
The second-year defensive back's knee appears to be healthy after he suffered an injury that held him out after Week 6 of last season. Castro-Fields will fight for a depth spot on Washington's 53-man roster after not recording a tackle last season in two appearances during which he played six snaps on defense and 13 on special teams.