The Tunisian striker who has netted five goals for Dundee this season, joins long term injury Craig Wighton which leaves the Dee short of strikers.
The club have yet to announce how long Moussa will be out for.
Darren O’Dea’s status is still unknown after being substituted with a knee problem on Saturday but he has had a scan to determine the extent of injury.
There could be some good news on the horizon for Dundee fans.
Roarie Deacon who was left out of Saturdays clash with Hamilton with a strain has been making good progress. Also, Randy Wolters injury which he picked up during the clash with Accies is not as bad as first feared.