Spanish league president Javier Tebas lashed out at Real Madrid on Thursday, saying the club leadership has “lost its mind” for accusing Spain’s referees of being biased against the defending champion. The head of La Liga said it was considering taking legal action for the letter that Madrid published this week in which it accused the league of being “adulterated” to favor other clubs. The letter was sent two days after Madrid felt it was hurt by alleged refereeing mistakes in a 1-0 loss at Espanyol.