The center half was withdrawn during the team's 5-1 win over Sparta Prague on Thursday night.
While the Reds are all but through to the quarter finals, the result did come at a cost.
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Manager Jrgen Klopp told his post-match press conference: "We don't know (yet).
Ibou said to me when he passed me in that moment, 'I thought if I do another sprint then it could be bad.' So, he said he should be fine, but we don't know.
"Joey (Gomez) is fine. We took him off, he played a lot of games so that was more rotation, precaution. Now let's see what is with Ibou."