Celtic now only have one player involved in a major international tournament this summer after the United States crashed out of Copa America overnight. The Stars and Stripes lost 1-0 to Uruguay courtesy of a 66th-minute winner from Matheus Olivera. This capped a disappointing group stage in which they registered just three points owing to a comfortable triumph over Bolivia on matchday one. Last week, a damaging 2-1 defeat to Panama sent shockwaves through the tournament. Cameron Carter-Vickers came off the bench for the second half; however, Gregg Berhalter’s side put themselves up against it …