Riggott picked up the injury in Saturday’s defeat at Manchester City.
The former Derby ace was forced to leave the pitch after 68 minutes.
Scans have shown that Riggott has torn his medial knee ligament.
Riggott picked up the injury in Saturday’s defeat at Manchester City.
The former Derby ace was forced to leave the pitch after 68 minutes.
Scans have shown that Riggott has torn his medial knee ligament.
