One of the accusations that has been thrown at this Rangers team is that they simply don’t have the mentality required to go to Parkhead and beat Celtic. The last time a meaningful league game was won in an Old Firm was Steven Gerrard’s last in 2021 when Filip Helander’s header was the difference between the two sides. The last victory away from Ibrox was even longer ago, but this doesn’t stop Philippe Clement from believing that his squad has the mental strength required to close the gap at the top. READ MORE: Rangers vs Celtic: Old Firm all-time record attendancesPhilippe Clement backs Range…