EDIT: Fabinho, Matip and Gomez were all pictured in training on Friday afternoon.
Liverpool’s Premier League campaign gets underway against the Hammers on Sunday afternoon, as the Reds begin their quest for the title.
Klopp’s plans were seemingly dealt a blow when Fabinho was pictured leaving Melwood with doctor Andy Massey on Thursday.
It was immediately rumoured that the Brazilian would miss out on Sunday with an injury, but Klopp says it is illness that could prevent him from featuring.
“The scan was clear. It was only a checkup, but he felt ill when he came back so we sent him home again,” he told reporters on Friday.
“He was not feeling really well, I’ve not seen him so far [today]. We will see.”
Klopp confirmed that Dejan Lovren will definitely play no part after his late return from the World Cup, but provided a more optimistic update on the availability of Trent Alexander-Arnold and Jordan Henderson.
“We will see [with the World Cup players], they’re all in a different shape,” he explained.
“Trent [has been back] a bit longer in which is good; Hendo in and full of power, but not too long in. It’s Hendo, so you always think about him.
“Dejan will not be available for the weekend, that’s how it is.
“We will see, we don’t have big issues but these little things to think about—if it’s a risk or not, and if it’s a risk, whether we take it or not.
“We’ll have a fantastic football team on the pitch and hopefully I’ll have to make a few decisions.”
“Ragnar [has] no real chance, Joel did parts of training yesterday, like Joe did. We will see how they are today,” he added.
James Milner should be available despite requiring 15 stitches in his head after the 5-0 win over Napoli in Dublin, having trained this week in a protective headband.
Alexander-Arnold is likely to start at right-back having featured in the Reds’ final two pre-season friendlies, but Klopp’s issues at centre-back are more concerning.
This would mark a big milestone for the 21-year-old, who spent much of last season sidelined with a back injury before being called up to first-team training in February.