Lee Sharpe feels Ole Gunnar Solskjaer has built a strong squad at Manchester United, but believes striker Anthony Martial represents the "only question mark" for him to solve.
Martial has been criticised this season for his inconsistent performances and has struggled to cement his place as United's leading No.9.
The presence of veteran Edinson Cavani has highlighted the work still to be done if Martial is to fulfil the role long term, and Solskjaer admitted recently it is unlikely the Frenchman will feature again this season due to injury.
And former Man Utd star Sharpe has questioned whether Martial will live up to his full potential at Old Trafford. Asked if any of United's current crop need replacing, Sharpe, speaking exclusively to
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