Manchester United manager David Moyes is increasingly confident of signing Marouane Fellaini while the Everton midfielder is also set on a move to Old Trafford. The Belgian 25 had a buy-out clause in his contract worth £23million but it expired at the end of July when United were still chasing Cesc Fabregas. Roberto Martinez is not keen on allowing Fellaini to leave and tried to ward off United on Thursday. He said: ‘When you are in a strong position financially you will never sell a player for less than the buy-out clause’ said Everton’s manager. ‘The buy-out clause gives you control as a buyer. We have had no approaches for Marouane Fellaini. ‘Just because you have a clause it doesn't mean you are stopped from putting a bid in for less money that's never been the case. If someone meets the valuation you haven't got a say as a club. As a manager that worries you because you don't have a decision to make. ‘I don't want to be surprised that I am not losing a player. I think maybe clubs know he is very very happy at Everton. I think this season or this window is different in that a World Cup is just around the corner and sometimes players are quite happy not to unsettle their routine. ‘The World Cup is a big event and a player wants to carry on with your good routine from a football point of view and make sure you don't gamble on changing that. We want to keep our best players. We want to improve window after window. If you lose players it's harder.’ Martinez who says Darron Gibson is '50/50' to be fit for his first game in charge at Norwich tomorrow stopped short of assuming the stance Liverpool have taken with Luis Suarez and accepts Everton may be forced to consider their options if United offered significant money for Fellaini.