Real Madrid are rattled by Chelsea beating their transfer ban last week.

The Mirror says Real Madrid are fearful of Roman Abramovich's billions in the transfer market and they consider the London club as their principal rivals in the pursuit of players.

A few phone calls from Stamford Bridge complicated Madrid's move for Kaka last summer, and this year the Spanish club are concerned that Chelsea will be the biggest hurdle in their pursuit of Franck Ribery.

Real Madrid have a gentleman's agreement with both Barcelona and Manchester City that they will not compete for the same players at the same time - although with everyone eyeing up David Villa and David Silva, the strength of that handshake is set to be tested.