Manchester United manager Erik ten Hag cut Phil Jones and Brandon Williams from his Europa League squad due to their prolonged recovery timescales from injury.
The two defenders were excluded from United's 25-man squad and although Williams is a locally-trained player he no longer qualifies for Uefa's 'B list' as he was born before September 1 2001.
Jones, 30, has not trained with United since players returned for pre-season training on June 27 and Williams, 22, sustained an unspecified injury in early July that has prevented him from figuring under the new United manager.