Spain international Xabi Alonso has put English clubs on alert after he admitted his future could lie in a return to the Premier League.
The Real Madrid midfielder has 18 months to run on his current deal and talks over an extension are currently on hold.
With the increased competition for places in the centre of midfield since the arrival of Luka Modric in the summer, coupled with Alonso's advancing years, the 31-year-old concedes his future is uncertain.
"I've no idea what will happen," Alonso told reporters in Spain.
"I have not decided on my future. I will only stay at Real Madrid if I can offer the same level on the pitch as I can now and we will see what happens in the next few months.
"There is always a chance I could go back to the Premier League as I always enjoyed good times there."
Alonso spent five successful years to Liverpool during which he scored 18 goals in 206 appearances before moving to the Spanish capital in 2009.