Liverpool midfielder Dominic Szoboszlai faces another spell on the sidelines after suffering a recurrence of his hamstring injury against Brentford.
Szoboszlai, who missed the previous two games with the injury, had to be replaced after 32 minutes of the 2-1 win at the Gtech Stadium.
Right-back Jeremie Frimpong, who came on at half-time, also went off injured on what could prove a costly afternoon for head coach Andoni Iraola.
"I think we have a very delicate situation," said Iraola. "We were coming from playing Champions League away two days ago, we arrived late at night and probably with not a proper recovery.
"You are in doubt between the players that have already started two games and are very tired, or the players that are recovering from injuries but you're probably not 100% certain.
"They were different cases. Dom felt the same injury, it's not a new injury and was probably not healed enough, so we will need more time with him. Jeremie's was new, I think he finished cramping the other day (against LASK).
"I put him on because playing against 10, going forward I thought he could give us more than Ronald Araujo.
"But it will mean we will lose Dom and Jeremie for some time."
The good news for Iraola was Alexander Isak marking his return from injury with the winner as Liverpool came from behind to beat the nine-man Bees.
The Reds were misfiring as they trailed to Keane Lewis-Potter's first-half header, but the match turned on a needless red card for Brentford's Yehor Yarmoliuk on the stroke of half-time.
Victor Munoz hauled Liverpool level after the break before Isak struck with his fifth goal of the season.
Brentford then lost Vitaly Janelt to a second yellow card in stoppage time.
According to Opta, German playmaker Florian Wirtz created nine goal chances, the most by one player in a Premier League game since 2021.
"I think, especially in the second half, it's the situation that if you need a player there, you need Flo," added Iraola.
"There's very few spaces, small pockets, time on the ball, some delicate things you have to find because Brentford is a team that defends really, really well the box. I think you need players like Flo."
