makers William Hill have formally requested a valuation of Playtech’s 29% stake in the firms’ William Hill Online (WHO) joint venture.

Providers Playtech revealed the news in a statement, adding that they were “committed to the smooth handover” of the stake should Hills exercise their right to purchase it.

Hills have the right to exercise a call option on their partner’s stake in the unit, which was created in December 2008.

Playtech CEO Mor Weizer said: “WHO has been a phenomenally successful and transformational partnership for William Hill and Playtech, consistently achieving double-digit growth year on year.

“Current trading is very encouraging and regardless of William Hill's as yet undetermined final decision on the call option, we look forward to working with WHO and maintaining our very positive relationship.”