It comes as the owner of the Mecca Bingo and Grosvenor Casino brands decided that it will no longer recommend that shareholders accept a takeover offer from Guoco Group.
On 30 June, Guoco announced that its offer would remain open until 15 July with a further seven-day extension possible. Rank has now told shareholders to reject the proposal.
Shareholders who have already accepted the offer between 17 June and 1 July have been recommended to submit indications of withdrawals by 15 July.