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Sneijder has been linked with a move to Old Trafford for some time while Chelsea boss Jose Mourinho still holds close ties with the Dutchman from their time at Inter Milan.

And with reports that Monaco are interested in the midfielder, Gala's president Unal Aysal has revealed Sneijder's €20m (£16m) release clause.

Aysal said: "Sneijder is a good player. We want to keep him at Galatasaray.

"If we receive an offer of 20 million euros we do not have the luxury of saying no. That is stipulated in the contract.

"All I can say is that if any club pays us 20 million euros and he wants to go then we can't force him to stay — it's written in his contract."

Sneijder has played a key role in the Netherlands squad which made it to the semi final of the World Cup.

It appears Galatasaray are happy to cash in on the 30-year-old but won't budge on offers below his release clause.

United have already signed Luke Shaw and Ander Herrera for a combined fee of around £60m but Chelsea have been busy too.

Diego Costa looks nailed on to join Cesc Fabregas Mario Pasalic at Stamford Bridge as Mourinho continues to tweak his Blues side in a bid to win the Premier League next season.