Manchester United midfielder Marouane Fellaini has vowed to repay David Moyes for being the 'most important person in his career'.

The 31-year-old, who followed Moyes from Everton to United in the summer, has struggled to make an impact at Old Trafford in his first season at the club.

However, after overcoming injury problems the Belgian international is keen to help the Red Devils return to the form shown under former manager Sir Alex Ferguson.

"Man United had the same manager for 26 years - to change that is not easy for anyone. The supporters and everybody else has to give him time," Fellaini told Sky Sports News. "What makes United different is that they stand by managers. You look at the career of Sir Alex Ferguson and he managed the club 26 years.

"You have to give David Moyes time as well. He is a strong character. That's why he can take the pressure. Given time he will be good for Manchester United. I can only say a huge thank you because I learned so much from him.

"He is the most important person in my career. I could never say something bad about him because he has done everything for me. He has done so much or me that of course I want to repay him at Manchester United."

Fellaini signed for United in a deal worth £27.5m.