Atletico Madrid to sue Real Madrid

Atletico Madrid are thinking to sue city rival Real Madrid.
French left-back, Theo Hernandez is becoming a problem for Atletico Madrid and Real Madrid.

Real Madrid leaders have started negotiations for the transfer of the Frenchman, who is on loan in Alaves.

Atletico now are thinking to sue Real Madrid, because they believe that Real Madrid has broken the rules by talking to a player who is under contract with another team.