Madrid were petulant in their games with Barcelona this season, having numerous players sent off and being outplayed in four of their five games, as well as losing out to their rivals in the league and Champions League.
In addition, new Real coach Jose Mourinho is a notoriously bad loser.
“We believe that this season Real Madrid has gone beyond all the limits of the necessary sporting rivalry, making accusations against our club that have no foundation,” Rosell said.
“The rivalry will continue next season but we will not allow the limits of sporting behaviour to be exceeded again.
“Football deserves clean competition and FC Barcelona will do everything to preserve that.
“If necessary, we will take legal action and take the case to the relevant sporting tribunals.”
