Former Swansea and Napoli striker Michu has been forced to quit football at the age of 31.
The once-capped Spain international has suffered from a persistent ankle problem which limited him to only 12 starts for Real Oviedo in Spain's Segunda Division last season.
"According to medical reports, the current situation of my right ankle has come to a point where it has forced me to say goodbye as a professional football player today," Michu said in a statement on his Twitter account.
Arsenal defender Carl Jenkinson is a target for Newcastle, Brighton, Burnley and Swansea, sources close to the player have told ESPN FC.
Jenkinson, 25, is set to leave Arsenal this summer after making just one appearance in the Premier League last season before being omitted from the club's squad for their preseason trip to Australia and Asia.
He returned from a serious knee injury last October, but found himself down the pecking order in Arsene Wenger's first-team plans.