MADRID (Reuters) -- A war of words between Barcelona and Real Madrid intensified on Thursday when Barca president Sandro Rosell accused their bitter rivals of anti-sporting behavior and slammed Real coach Jose Mourinho.
Bad blood boiled up between the Spanish giants around four clashes in three competitions in 18 days in April and May and Rosell used his end-of-season news conference to read out a strongly-worded statement condemning Real.
"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."
European champions Barca eliminated Real from the Champions League and beat the Madrid club into second place in La Liga for a third straight season, while Real claimed a dramatic King's Cup final win over Barca to claim their only silverware.
The four matches were marred by play-acting, brawling and post-game allegations of cheating and racist abuse.
After the Champions League semi-final first leg, Mourinho claimed Barca enjoyed favourable treatment from referees and Real filed a complaint with UEFA?which was rejected ? accusing Barca players of diving and alleging midfielder Sergio Busquets had called defender Marcelo a monkey.
Barca filed their own complaint with UEFA over Mourinho's comments and the Portuguese was suspended for five matches and fined 50,000 euros ($70,700).
He faces an appeals hearing on July 29 and has said he will use all means at his disposal to fight the sanction.
"The news conference that the Real Madrid coach gave after the Champions League semi-final first leg at the Bernabeu shamed anyone who considers themselves an athlete," Rosell said.
Barca were also outraged by a report on Spanish radio station Cadena Cope, which cited an unidentified Real official as its source, that suggested Barca's players and medical staff were engaged in illegal doping.
"I can assure you that if someone, in the name of FC Barcelona, had made an accusation of this kind we would have acted with firmness, denying it immediately and taking those responsible to court," Rosell said.
"We would have appreciated a similar response from Real Madrid but unfortunately this was not the case."
Rosell said it was now up to Real president Florentino Perez to mend relations between the clubs.
"A few days ago the president of Real Madrid said he would not stop until the club had won a tenth European Cup," he said.
"We hope that they attempt this on the pitch, in a sporting manner and rediscovering a way of behaving that I believe many Madrid fans want.
"The president of Real Madrid has a chance to reconstitute our relations, on and off the pitch.
"Football, which usually gives you back what you put in, will be the great beneficiary."