Ole Gunnar Solskjaer was given a reminder of a worrying problem as Manchester United beat West Ham to secure a place in the FA Cup quarter-finals.
United are in the hat for Thursday's draw - but they made hard work of their victory, needing an extra-time winner from sub Scott McTominay to see off the Hammers.
Solskjaer had used all five substitutions before his side broke the deadlock - bringing on big guns Bruno Fernandes, Edinson Cavani and Luke Shaw in search of a winner.
And the manager was shown yet again that his Red Devils are not as effective in attack without their talisman Fernandes. The Portuguese playmaker has missed just two games all season in all competitions, and has come off the bench just three times - having been in the
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