No!
Substitutions may be made during any stoppage in play and with the referee's permission. Many leagues modify this rule to limit substitution opportunities, particularly when unlimited substitutions are allowed.
16 teams
None
90
Poland hosted UEFA Euro only once, in 2012.
16 teams
650
16 cam
45
None or up to 3. Depends on what the coach has done previously in the game. Soccer only allows 3 substitutions in any official game.
one, that was Joe Cullis, he scored 5 goals