Celtic are enjoying pre-season in the United States as the squad build up to their first match of the tour against DC United this weekend. Commencing at 12.30 am on Sunday (GMT), supporters will be excited to see the Bhoys back in action, including new goalkeepers Kasper Schmeichel and Viljami Sinisalo. Brendan Rodgers’ men have already visited the White House, among other excursions Stateside, with plenty of time already spent on the training field despite the warm climate. Ultimately, the USA Tour will act as the perfect warm-up act ahead of the competitive action commencing next month, prov…