Derby's on-loan striker James Wilson has returned to parent club Manchester United due to a serious knee injury.
Wilson, 20, sustained the injury during training with Derby on Monday and both clubs are waiting to learn the full extent of the damage.
"On-loan James Wilson has returned to £MUFC for assessment on a significant knee injury sustained during Derby County training on Monday," United stated on Twitter.
Wilson joined Derby on a season-long loan in August and has made four appearances for the Sky Bet Championship club, including three starts.
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