Diogo Dalot missed Manchester United's Europa League win over LASK through injury.
Dalot was a notable absence as Ole Gunnar Solskjaer heavily rotated his squad for the clash, with United ahead 5-0 after the first-leg.
The Manchester Evening News says the Portuguese fullback suffered yet another injury setback.
He has remained in United's squad for the latter stages in Germany and could return in time.
Dalot has made seven starts and four substitute appearances this term.
