He is keen to stay in the Premiership however and both Bolton and Blackburn are thought to be interested, perhaps in another long-term loan deal.
Meanwhile, Bolton are also being linked with a move for Barcelona striker Maxi Lopez.
The Argentinian striker could be set for a season-long loan move next season to get regular first-team action.
Barca sporting director Txiki Begiristain has confirmed that a temporary switch to England is an "attractive option" for Lopez.
Bolton could face competition from Charlton and West Ham for the 22-year-old, who made just two La Liga appearances last season.