Other news outlets had speculated that Starwood Hotels might be the mystery bidder.
In May, Sky reported that Intercontinental's board had rejected a bid from a U.S. company that would have valued IHG at 6 billion pounds.
Sky now reports that Wyndham made a preliminary offer to acquire Intercontinental, and the offer is no longer pending but could be revived. "Wyndham is understood to have been examining a merger with IHG as a means of pursuing a so-called inversion, under which its tax domicile would have switched to the UK to take advantage of favourable corporate tax rates," Sky reported.
A spokesman for Wyndham declined to comment on the Sky report. "We cannot comment on speculation," Michael Valentino, the vice president of marketing and communications of Wyndham Worldwide, said in an email Tuesday to CNBC.