Celtic are enjoying a fun introduction to their pre-season tour of the United States and will be gearing up to face DC United this weekend. The Bhoys landed in Washington earlier this week and have already hit the training field, putting in the hard yards ahead of the new season. Finnish goalkeeper Viljami Sinisalo has also joined up with his new teammates after completing a £1 million switch to the Scottish Premiership holders from Aston Villa, sprinkling some extra excitement into proceedings. Visiting famous landmarks is always a handy port of call in a new environment, and Celtic were pres…