Celtic will have already switched their focus to preparing for the visit of Heart of Midlothian this summer following last weekend’s Scottish Premiership events. The Bhoys entered Dens Park knowing that three points were necessary to retaliate to Rangers’ narrow victory over St Mirren earlier in the day. Despite a tricky away clash on a dry surface, Celtic got the job done resiliently, with James Forrest to thank for a double that helped ward off a late fightback from the hosts courtesy of Antonio Portales. Of course, Brendan Rodgers’ will acknowledge his men didn’t put on a vintage display on…