Swansea chairman Huw Jenkins values Arsenal and Liverpool target Michu at £30million.
Swans boss Michael Laudrup insisted that the Spaniard was worth £30million only four months into his impressive debut in the Premier League, where he scored 18 times in 35 appearances.
The 27-year-old signed for just £2.2million from Rayo Vallecano, but in light of Michu's call-up to the Spain squad, Jenkins now agrees with Laudrup's valuation.
Jenkins said: "We've seen with Tottenham and Gareth Bale that every player has a price. 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."