The Spaniard last played in the 1-1 draw at Norwich City on December 15, with manager Michael Laudrup subsequently revealing that he was due to have an operation.

"Swans striker Michu has today undergone a successful ankle operation which will keep him out for six weeks," read a statement on the club website.

"Michu, who has scored six goals in 19 games this season, missed the festive fixtures with Everton, Chelsea and Aston Villa due to the injury.

"But after the operation went ahead as planned in Portugal, the 27-year-old is set to be sidelined for the next six weeks before making his return to the first team."

Michu joined Swansea from Rayo Vallecano last year and has since scored 28 goals for the club.

He published a picture of himself on his Twitter feed, apparently taken after the operation, which shows the 27-year-old lying in a hospital bed and making a 'thumbs-up' gesture.

"I will be back!!! Thanks so much for your support!" he wrote.