Derek Ferguson has blasted one Rangers star after what he did against Celtic in the Old Firm last Sunday. The Light Blues and their arch-rivals played out one of the greatest Old Firm spectacles in some time as the Scottish Premiership title thriller ended in a 3-3 draw at Ibrox. Celtic led comfortably at half-time but a mentally strong Rangers side twice came from behind to earn a point and prevent Brendan Rodgers’ men from extending their lead in first place. The contest was strewn with high drama both from a football point of view and in terms of the refereeing decisions made across the cla…