Rank Group is in the sights of another potential buyer after the Asia-based Guoco Group became the latest investor to declare a sizeable stake in the casino and bingo operator.

Guoco, an investment group that bought the Clermont Club in London’s Berkeley Square from Rank in 2006 for £31m, has built a 3.17 per cent stake, Rank said in a regulatory statement. Guoco’s holding follows Rank’s disclosure last month that Genting, the Malaysia-based gaming operator and owner of Stanley Leisure, had acquired a 10 per cent stake.