The Senegal winger signed a two-year deal with the Owls in August.
The Senegal international posted a short video of himself laying in a hospital bed, beside the caption: "Successful surgery and end of the season," in the early hours of Tuesday morning.
Sougou has failed to appear in an Owls matchday squad since their February defeat to Shrewsbury Town in the FA Cup and had he been fit, it's unlikely that he'd have been picked ahead of Fernando Forestieri, Ross Wallace, Aiden McGeady and Marco Matias anyway.
Despite signing a two-year deal at Hillsborough in August, the 31-year-old could well have played his final game for the club.
Sougou, who played Champions League football for CFR Cluj, was never going to replicate the success of the last Owls winger to be signed from Marseille, but certainly proved a useful addition in the early months of the campaign.
He was instrumental in Wednesday's 4-1 win against Mansfield in the Capital One Cup and earned them perhaps the least deserved point in club history a week later against Reading.
But it soon became evident that Sougou was signed to do a job; to be a different option where needed; to allow others to rest.
Of his five league starts this season, each one was away from home and only against Blackburn in November had Wednesday not played another league game within the past three days.
He also started five out of seven cup matches, but was left out of the important one against Arsenal.
Whatever division they're in next season, Wednesday will be looking to upgrade their current crop, and that is likely to mean moving on players like Sougou - who would have probably been kept on in years gone by.
Should this prove the case, it'd be no slight on Sougou, but perhaps the biggest indicator of how far the club has come since the summer.