According to UEFA rules, clubs can replace an outfield player in their squad if they have suffered a long-term injury.
A long-term injury is defined as one that lasts at least 60 days from the date of the injury or illness.
Muani has only made eight appearances in all competitions this season and is still waiting for his first goal for Thomas Frank's team.
Mathys Tel, who missed out on the original squad announcement, could be a potential replacement for Muani.
Other teams, including Liverpool, have made similar squad changes due to injuries to key players.
Muani has already missed five games this season due to a muscle problem and may be prone to further injuries upon his return to full fitness.
