A leading Manchester United fans' group called on Sunday for clarity on the future of the English giants amid speculation British billionaire Jim Ratcliffe is set to take a minority stake in the club. United's owners, the American Glazer family, announced nearly a year ago that they were exploring "strategic alternatives to enhance the club's growth", with a full sale one of the options. Qatari banker Sheikh Jassim Bin Hamad Al Thani withdrew his attempt to buy the 20-time English champions, a source close to the bid told AFP on Saturday.