Manchester United are unsure whether Wilfried Zaha has the mental strength to succeed at a big club as they consider whether or not to send him on loan for the remainder of the season.

Zaha has featured just twice for United under David Moyes after Sir Alex Ferguson paid some £15m to acquire his services from Crystal Palace in January.

He helped his former club secure promotion to the Premier League after being loaned straight back to Selhurst Park but having finally made the move to Old Trafford, he has struggled to make any sort of positive impression.

The 21-year-old is so out of favour that he was not even selected in the squad for Manchester United's draw with Cardiff City at the weekend, and instead sat among journalists in the press box.

He has been linked with a loan move away from United in January and it was believed that Moyes would be prepared to let him leave the club on a short term deal in order to gain regular first team football.

However, the Daily Mail believe that the Premier League champions are unsure whether he has developed the mental toughness needed to succeed at the very highest level which has subsequently put off a number of suitors for Zaha.

There is little doubt that the former Palace winger has the ability to succeed but he must learn to impress in training and show that he can do more than simply beat players with his array of tricks and searing pace.

Zaha must show he understands the need to help out his full-back and it seems Moyes may well continue to omit him from the first team squad even though Ashley Young, Nani and Antonio Valencia have failed to show their best form this season.

Manchester United were hoping that the young English winger would have an immediate impact when he arrived in the summer but he has yet to see single minute of Premier League action this season.