If his nation make it all the way to the Final on July 10, Lustig – theoretically, at least – would be due to turn out for the Hoops in the first Champions League qualifier just two days later.
He said: “Celtic is probably the worst club to play at when it comes to time off in the summer.
“So, in a normal summer, I would say you have three weeks. A lot of teams have had much as eight or nine. That is a big difference, especially here when you don’t get a break in the winter, albeit we will get one next season.”
The three Champions League qualifiers are season-defining encounters and Lustig added: “The first couple of months of the campaign are so important for us and we need to be ready. In a perfect world, you want to have a pre-season for four or five weeks, to build your whole body up for the season.
“But, at Celtic, you have to start playing games right away. That is just how it is. It’s tough.”