In a week when Europe’s top soccer executives have hunkered down amid a wave of unprecedented leaks, the leader of Spain’s league took the opportunity to go on the attack.

Emboldened by recent leaks of documents that implicate Manchester City and Paris St.-Germain in possible attempts to obscure their spending and establish cozy relationships with soccer regulators, the La Liga president, Javier Tebas, said in an interview that the two clubs — and others that flout soccer financial rules — should face punishments that he says are long overdue.

“It was clear in the past that they were making dirty tricks; everything is crystal clear now,” Tebas said of City and P.S.G., three days after the surfacing of leaked documents that appeared to confirm his long-held complaints the clubs had manipulated financial control measures.

Still, Tebas said it was not clear either club would face sanctions, in part because of a tangled web of financial relationships that City, P.S.G. and European soccer’s governing body, UEFA, have with financial powers in the Middle East. The royal family of the United Arab Emirates owns Manchester City, the reigning Premier League champion, and the sovereign wealth fund of the Qatari royal family owns both P.S.G. and beIN Sport, the network that has committed billions of dollars to televise the Champions League and other top competitions.