Wales manager Chris Coleman thinks it will be impossible for Swansea to keep hold of star striker Michu if he maintains his current form.
Michu's arrival from Rayo Vallecano barely caused any interest at the time, but the Spaniard has gone on to become one of the biggest success stories this term.
With just over half of the season gone, the £2million striker has bagged an impressive 13 Barclays Premier League goals, a record only bettered by Robin van Persie and Luis Suarez, who cost a combined total of nearly £50million.
Yet as Newcastle have seen with Demba Ba recently, success brings suitors and several clubs have been linked with a move for the 26-year-old.
Coleman, who played nearly 200 times for the Swans, thinks Michu will stay at the club this month, but admits it will be hard for manager Michael Laudrup to keep the player at the Liberty Stadium thereafter.
"It won't be easy for them to keep hold of him," said Coleman, who was speaking at an event to publicise Swansea's Capital One Cup semi-final against Chelsea.
"If any player at Swansea City is performing like Michu is then the big boys are going to look, and if they want you enough they will pay the money.
"As much as Swansea want to keep him, they won't be able to say no to that. They might say he is not for sale, but everyone is for sale at a price.
"A lot of people will say he remains an unknown entity, but if he repeats what he is doing then that is when the danger will come.
"That is when one of the bigger teams will probably take a chance on him."
Swansea, who sit ninth in the Premier League, are hoping to add yet more sparkle to their impressive season over the next fortnight by reaching the Capital One Cup final.
The Swans beat Barnsley, Crawley, Liverpool and Middlesbrough to reach the semi-finals, where they face European champions Chelsea.
Although the Blues are blessed with a star-studded multi-million pound squad, Coleman thinks Swansea have a good chance of making their first cup final trip to Wembley if they keep the tie alive following Wednesday's first leg at Stamford Bridge.
"Chelsea are looking strong but Swansea have been playing good football for the last six or seven years," Coleman said.
"It won't be an easy game for Chelsea. Swansea have a good chance of getting through.
"They have proven that they can beat anyone. If they get beaten 1-0 it's not the end of the world.
"That would put them in a good position because not many people like coming to the Liberty Stadium.
"Swansea have 29 points in the Premier League so it won't be a big upset if they win."