Gregorio Manzano has asked Mallorca to keep Juan Arango, but accepts that if a club makes an incredible offer they may be forced to sell.
The Son Moix boss is desperate to keep hold of his star midfielder despite reported interest from several teams, most notably Tottenham, West Ham and Bolton.
Spurs were reported to have had a bid rebuffed last summer for the highly-rated Venezuelan and could well make another approach after the World Cup.
"I have asked the president (Vicente Grande) to try and ensure that Arango does not leave," he said. "We have to try and keep him here."
Despite that, Manzano understands that Mallorca could ease their financial problems should a club bid é¼8 million (£6.5 million) or higher.
"If there is a team that is ready to offer crazy money to sign him then, well, because of the way football is we may have to think, but he is not the market and be kept.
"The club will certainly not undersell him because we will need to go out and sign another player with similar qualities with the money that we receive and his replacement will not be cheap."
Looking ahead to the new season, Manzano is keen to begin his rebuilding plans and is hopeful that there will be some cash to sign players on a permanent basis.
Last summer Manzano's predecessor, Hector Cuper, brought in a number of players on loan to pad out his squad.
"We will make a great effort to sign some good players in certain positions," he continued. "The less we sign on loan the better as well.
"The club needs to grow with players that belong to it."
Manzano saved the club from relegation this season after returning to Son Moix for his second spell in charge in February when the club was rooted to the foot of the table.