Jurgen Klopp has revealed that Dejan Lovren has not travelled to Portugal for Liverpool's Champions League clash with Porto because he is ill.
The Croatian defender was not included in the 21-man squad for the quarter-final second-leg tie but Adam Lallana is available while Jordan Henderson has recovered from an ankle knock and should feature in the game.
Alex Oxlade-Chamberlain played for the Reds' Under-23 side at Leicester City on Sunday but will not be involved in Portugal as Liverpool attempt to reach the semi-finals of the Champions League.
Liverpool won last week's first leg at Anfield 2-0 thanks to goals by Naby Keita and Roberto Firmino and are 17/2 to win the second match by the same scoreline with Henderson available at 8/1 to score at any time in the encounter.
Klopp said: "Dejan is ill. He had a bad night. He had no chance to travel. That is the reason for that.
"We have Joe (Gomez), so should be fine for that. We have Fabinho for the position, so that should be OK. We never forced it and we cannot force it.
"Pretty much all the rest are travelling; Ox is not, it makes more sense for him to train here. However much we all love having Ox around, it makes absolute sense for him that he stays here.
"Adam (Lallana) is back in the travelling squad. Hendo is all fine. The other players are all fine, that's really good. Nothing happened. We all have knocks and Hendo got a knock, but that would never take him out."
Liverpool are available at 10/3 to win the Champions League this season and at 11/10 to clinch the Premier League title.