Luis Suarez “cannot understand” why players are being forced to play so many fixtures in such a congested period.
South American nations are playing two World Cup qualifiers over the coming days.
After FIFA inserted an extra international break into the calendar.
It is a situation that leaves Suarez frustrated.
“I have to speak about the physical part of being a human being as well as a sportsman,” he told reporters.
“We cannot understand how it is that we will compete in a World Cup qualifier next Tuesday and that Pajarito [Valverde] in this case, will have to compete in a Copa del Rey match.
“That my colleagues from Getafe, Mauro, Damian and Mati, will have to play that Friday in a LaLiga match.
“The schedule is quite tight, but we have to adapt to it.
“We are professionals and will do our job on the pitch because that is demanded from us.
“But sometimes the players are not in other people’s thoughts.
“It happened before when we played three qualifiers in 10 days, with long trips of more than 12-15 hours.
“And obviously, fatigue then has an influence.”
Suarez, however, insists the squad’s full focus is on arresting their dismal form and pushing on to qualify for the World Cup in Qatar this year.
He said: “There are players who go through different stages of both winning and losing streaks.
“But when you come into the national team, the games that you have been playing suddenly do not matter.
“What matters is the hunger to compete, they wish to live and feel what I feel with this shirt on and to keep demonstrating that I am prevailing.
“And that I want to keep competing and have the burning ambition to make it to the World Cup.
“I’ve been lucky enough to have played in three World Cups already and now, at 35 years old, I want to continue with that same ambition.
“And I wish to keep playing World Cups and to have the chance to play at my fourth World Cup. Because of that, I am here.”
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