Anderlecht insist that Romelu Lukaku will not be moving on until their price is paid.
Lukaku has been chased by Chelsea for more than two years and they finally looked to be closing on him this summer, despite interest from rivals such as Manchester City and Arsenal.
Chelsea have been locked in talks but thus far they have not agreed terms with the Brussels outfit - who are believed to have set a €20million price on the head of the brilliant youngster.
"If a club like Chelsea pays the target amount, he leaves," Anderlecht general manager Herman Van Holsbeeck stated at a news conference.
"We are looking to make clear agreements next week, but Lukaku from a sporting aspect is much more important that the financial picture.
"And he is in no rush to leave - and if August 31 comes and he does not leave, then perhaps staying another year could be better.
"But we do not want this to drag on, it's not a complicated matter - they know the asking price."
Van Holsbeeck told the local press that he thinks the chances of a deal being done with Chelsea are '50-50'.