Swansea City chairman Huw Jenkins has delivery a stark warning to Michu's reported suitors Arsenal and Liverpool by claiming the Spaniard's valuation has increased following his maiden international call up for the World Cup qualifiers against Belarus and Georgia.
Michu has never represented Spain at any level but is in contention for his first cap as Vicente del Bosque's side go in search of the four points that will guarantee qualification for Brazil 2014.
Since moving from Rayo Vallecano for £2m last summer, Michu has scored 27 goals in 54 appearances for The Swans, with manager Michael Laudrup claiming the 27 year old's is now valued at £30m.
But in an attempt to warn off interest from both Arsenal and Liverpool, who are among the club's whose heads have been turned by Michu's impressive form, Jenkins says upon been given his first international call up by Spain, Swansea's premier marksman's valuation continues to soar.
"We've seen with Tottenham and Gareth Bale that every player has a price," Jenkins told the Daily Mail.
"We are not in that bracket with Tottenham but they sold a top player. We are realistic about that side of things.
"I would say Michael was about right with his valuation of Michu if you look at the current market, but this call up enhances that further. We know we have a very talented player and naturally we want to keep him."
While Jenkins and Laudrup have refused to budge amid interest in Michu, the south Wales club are seemingly resigned to eventually losing the forward.
Jenkins has shown himself to be a tough negotiator during his spell as Swansea chairman, forcing Liverpool to pay £22m for Joe Allen last summer after he allowed Brendan Rodgers to move to Anfield as manager.
He will need similar powers of obduracy when some of the Premier League big guns come calling, which could include Rodgers if reports are to be believed.
While Daniel Sturridge and Luis Suarez are closing in on becoming statistically the most potent partnership in Premier League history, Liverpool lack sufficient depth in attack with Fabio Borini out on loan at Sunderland.
Arsenal are suffering from similarly insufficient resources in attack, with Olivier Giroud the only genuine central attacking option after Arsene Wengher opted to sign Mesut Ozil in the summer transfer window.
Nicklas Bendtner made his first league appearance of the season in the weekend draw against West Bromwich Albion but his last top flight goal for the club came in December 2010.