Billionaire Barry Diller’s InterActiveCorp, the largest shareholder in MGM Resorts International, supports the casino operator’s $11 billion takeover approach Entain Plc, the U.S. company said on Friday.

MGM said a proposed merger with the British bookmaker would be “compelling” and believes a deal, amongst other things, would help grow BetMGM, its online sportsbetting operating in the United States.

MGM has also indicated that a partial cash alternative could also be made available to Entain shareholders. IAC, has indicated in its letter of intent that it would be willing to consider funding a portion of the partial cash alternative through a further investment in MGM due to IAC’s confidence in MGM and its prospects.

IAC further indicated in its non-binding letter of intent that it is IAC’s current intention that IAC’s additional investment into MGM for these purposes could be up to US$1 billion. The terms and amount of such investment would require the mutual agreement of IAC and MGM.

Entain, however, rejected the takeover advance earlier this week, saying it significantly undervalued the company and asked MGM for more information on the strategic rationale for a merger.