Roberto Firmino is a doubt for Liverpool's Champions League semi-final tie against Barcelona.
Firmino sustained a muscle injury in training on Thursday and was subsequently ruled out of the Reds' 5-0 Premier League victory against Huddersfield on Friday Night Football.
Speaking after the win, Liverpool manager Jurgen Klopp said: "Bobby trained on Thursday completely normal. It was not high intensity, we had to work on set-pieces a bit, a couple of things.
"I didn't see it in training, it happened obviously in the last situation in training, he felt the muscle a little bit.
"Now that's the official diagnosis: he has a small tear in a very small muscle. Apart from the word 'tear' everything is positive.
"It's Bobby so he might be ready for Wednesday, but we don't know obviously in the moment.
"Because it's him it's more likely than not, but we will see. Of all the badness you can get it's pretty much the best, but it's still bad enough that he couldn't play tonight."
Liverpool will continue to monitor the Brazilian who has made seven Champions League appearances this season, scoring three times.
Firmino was on the scoresheet twice over the course of two legs during Liverpool's 6-1 aggregate win over Porto in the quarter-finals.