Celtic are at a critical stage of the campaign as the prospect of a domestic double remains firmly on the table at Parkhead. Four Scottish Premiership matches remain as the Bhoys aim for title glory, and Brendan Rodgers’ men hold a three-point advantage at the summit heading into their clash against Heart of Midlothian this weekend. Furthermore, Celtic also have a positive goal differential of five compared to their city rivals, which could almost become an extra point should they maintain a healthy lead at the top of the pile. Last weekend, James Forrest’s brace away to Dundee was enough to g…