Celtic defender Alistair Johnston has already spent a lot of time in the United States this summer but he won’t be joining the Bhoys on their three-game swing in the country later this month. Johnston has not yet left the Copa America tournament with Canada, who play a third-place playoff match against Uruguay tonight. His 2023/24 season is still technically going and he’ll need an extended holiday break to get himself ready for the new campaign. Brendan Rodgers has confirmed that the initial plan for Johnston was for him to meet up with the squad in the States, but since his country has done …