The midfielder was out of contention after 53 minutes and will now further assess the issue with the club’s medical team.

Klopp explained during the post-match press conference, “He felt his hamstring and he was not able to play, otherwise he would have stayed on the pitch.”

Liverpool were also without Zinedine Zidane for a visit to Fox, with a muscle injury sustained while on international duty with Switzerland ahead.

Klopp said: “Shaak, how do I know him, he had a muscle injury with the national team that he didn’t really realize.

“Now he trained with us, we gave him a day off and then he came back and got involved in the session, but wasn’t fully involved and all sorts of things like that. He just did a little, then he felt a little. We then did a scan and saw him injured five or six days ago.

“No one knew about it, not even Shaak, but sometimes that’s how things happen and so he wasn’t able to get involved.”

Liverpool are set to return to train Mohamed Salah on Monday, however, he missed an encounter with Lester on Sunday evening.

“I heard it, yes, it is [was] Negative today, ”Klopp in detail. “I think it’s pretty common in testing from now on. Tomorrow we have the UEFA test for the Champions League and I am sure it will be in it.

“He can train with us tomorrow, that’s all. He will have two tests in the next two days, so yes, he will be tested like all of us. ”