Amad Diallo's loan move from Manchester United to Feyenoord has been thrown into doubt after he picked up an injury in training.
Feyenoord sporting director Frank Arnesen is awaiting a full assessment of the injury before deciding whether to press ahead.
Manager Ole Gunnar Solskjær confirmed a club had been lined up for 19-year old Amad following the arrival of Cristiano Ronaldo from Juventus.
Crystal Palace and Sheffield United had made enquiries but United are close to agreement with Feyenoord who finished fifth in the Dutch league last season.