Knott, who made his Black Cats bow on the final day of last season, has appeared 23 times for the Chairboys since moving to Adams Park on loan in August.
The 21-year-old wasn’t due to return to Wearside until the end of this month, but Sunderland have opted to end the ex-Chelsea youngster’s loan a fortnight early.
There has been speculation that Knott could be a target for League One Port Vale, but only on a loan deal.