The 28-year-old, who has only made two Premier League appearances for the Black Cats this season, went to the USA for an operation on a torn cartilage.
He last featured in a 3-2 defeat by Crystal Palace on 24 September.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!