Regardless of these fresh fitness concerns, rotation is something that will have been on Klopp's mind as the trip to Huddersfield kick-starts a run of six games in 23 days for his Liverpool side.
"If they don't perform I am angry, so how can we make sure they perform?"
Naby Keita's hamstring injury is of concern to Liverpool ahead of Saturday's trip to Huddersfield Town, a source has told ESPN FC, but Mohamed Salah, Sadio Mane and Virgil van Dijk are yet to be ruled out after having issues over the worldwide break.
The Reds saw 19 first-team players depart on worldwide duty during this month's break, but four returned early after suffering fitness issues. "That's it, pretty much".
Salah and Van Dijk withdrew from their national teams over the global break amid fitness concerns, but trained at Melwood on Thursday afternoon.
"It settled pretty quickly". He will play first-team football for Liverpool again, that's the best news. What it is exactly is not too important.
Sports Mole looks at how Liverpool could line up for Saturday's Premier League clash with Huddersfield Town at the John Smith's Stadium.