Celtic ramp up their pre-season preparations this weekend and play their first match in the United States for over a decade. Brendan Rodgers’ Bhoys take on Major League Soccer side DC United at Audi Field in the nation’s capital, Washington DC. After warm-up friendlies in Scotland against Queen’s Park and Ayr United, Saturday night’s match (local time) presents a significant step up in challenge and should test Celtic’s returning stars. Team stalwarts such as Callum McGregor, Greg Taylor, Reo Hatate and Daizen Maeda could all feature after getting back to training over the last ten days. The c…