Premier League clubs are monitoring Raul's situation at Schalke.
Sport says Aston Villa, Blackburn Rovers and Tottenham are all weighing up an end of season move for the Real Madrid legend.
Raul's first season in Germany has been a success, but the striker is unsettled.
The Spaniard is unhappy after seeing Felix Magath sacked and later appointed as new Wolfsburg coach. Raul moved primarily after being convinced by Magath about the potential of Schalke.
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