Real Madrid have reportedly become the latest club to show interest in Gary Cahill, joining Arsenal, Barcelona and Chelsea in the race to sign the Bolton defender.
Cahill was strongly linked with Arsenal and Tottenham over the summer, but neither club was able to agree a fee for the 26-year-old.
Bolton manager Owen Coyle said on Thursday that he "wouldn't be surprised" if Arsenal launch a renewed bid to sign the centre-back when the transfer window reopens in the New Year.
And it seems the Gunners will not be the only club looking to sign Cahill in January.
Arsenal and Tottenham remain keen on the player who was valued at £17million by Bolton last month, while Chelsea are also interested.
Clubs from outside the Premier League have also been monitoring developments at the Reebok Stadium, with recent reports suggesting Spanish champions Barca, and Italian duo Inter Milan and Juventus are also keen.
And according to the Sunday Mirror, Real Madrid are ready to enter the race for the England international.
Cahill is in the final year of his contract with Bolton and the Trotters know they will be forced to sell him at a reduced price in January, or risk losing him on a free transfer next summer.
And Jose Mourinho is said to be ready to see off rival bids - by securing the player's services for free.
If Cahill decides to move abroad, he can sign a pre-contract agreement with Madrid early next year, then complete a Bosman free transfer in the summer.
According to Sunday's report, AC Milan, Bayern Munich and Paris Saint-Germain are also interested.