Atletico Madrid chief Miguel Angel Gil Marin admits they're unsure of how the players will handle the resumption of season after the World Cup.
Gil Marin says mentally it will be a challenge for the players.
He explained, "As a football fan, bad feelings because they have broken the rhythm of a competition.
"All the clubs played with the handbrake on before playing the World Cup and they are not aware of what is happening with the performance of some of our players in the World Cup.
"After this, it is difficult to lift the player not only physically, but also mentally. Football is states of mind and when you feel failure it is not easy."