Coniglio is set to miss the next eight weeks following the procedure.
“There’s obviously relief Stephen has avoided injury to his ACL and there does still remain a chance he returns to the field this season which is great news,” GWS General Manager of Football Wayne Campbell told gwsgiants.com.au.
“He’s an incredibly dedicated and professional player and there’s no doubt he’ll attack his rehab with those same qualities.
“Stephen underwent scans and assessment following last week’s game and in consultation with our medical staff and the player himself, was cleared to play yesterday.
“Yesterday’s scans showed this is an entirely new injury and separate to the incident last week.”
Coniglio has averaged 26.6 disposals, 4.9 clearances and 4.2 marks per game this season.