From the
Montreal Impact website:For the first time in its history, the Montreal Impact will face one of the most prestigious clubs in the world, AC Milan, Wednesday, June 2, at 8 pm, during an international friendly match that will be presented at Olympic Stadium. The Impact will also play against Serie A (first division) Italian club Fiorentina, Sunday, May 23 at 2 pm, at Saputo Stadium.
Guys playing in the World Cup presumably won't be there (that's been announced as the case with Milan's North American postseason tour), but everyone else will! Tickets go on sale Friday, info is in the link above.