The big Belgian midfielder has been a hot transfer topic this summer, because a contract clause allowed him to leave Everton for £23.5million.
That loophole has now closed, and the Toffees' new boss Martinez is fully aware that the likes of United and Arsenal were waiting for it to run out - in the hope it would bring down the price.
But if that is United's attitude, then Martinez explained the champions - now managed by his predecessor, David Moyes - are wasting their time.
As Moyes continues to seek new faces for his midfield, the Spaniard said: "This is not a situation where we are actively putting up players for sale because we need the money, it is definitely not the case at all.
"And when you are in a strong position financially you will never sell a player for less than the buy-out clause.
"Marouane has that clause in his contract, and on July 31 it expired. From that point on, the club has got complete control in every single transfer. The clause lets everyone know where they stand.
"Yes, you are sweating on July 30 and 31, but after that we don't have to sell players. It's as simple as that."
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