Liverpool boss Arne Slot may need to rest Luis Diaz.
The Colombia attacker appears "exhausted", according to national team observers.
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Diaz was taken off late in their World Cup qualifier defeat to Bolivia.
Colombian sources say the winger is "exhausted" after a busy start to the season and have questioned whether Slot will need to give Diaz a rest when the Premier League resumes.
Liverpool host Chelsea when the Premier League returns on October 20.