Real Madrid boss Carlo Ancelotti hit out at the "crazy" football calendar which could see his side's South American players miss next month's Copa del Rey quarterfinals, but denied the club will put pressure on national teams to help resolve the situation.

Madrid could face Athletic Bilbao at San Mames in the cup on Feb. 3 with Vinicius Junior, Casemiro, Eder Militao, Rodrygo and Fede Valverde all absent.

The four Brazilians have all been called up by national team coach Tite for matches with Ecuador and Paraguay, with the latter game being played at 1.30 a.m. Spanish time (7.30 p.m. ET) on Feb. 2, while Valverde is in the Uruguay squad to play Paraguay and Venezuela.

"The calendar doesn't make sense," Ancelotti said in a news conference on Saturday ahead of Real Madrid's LaLiga game with Elche. "But this isn't just a Real Madrid problem. It's a problem for every team. Other teams will be affected by these call-ups too.