Definitions for "Substitutes"
A chemical, product, process or technology, which may be substituted for another to perform the same function or achieve the same end result.
If goods X and Y' are substitutes, the quantity demanded of X is directly related to the price of Y
a good that can be used in place of another.
A list of possible substitutes must be handed to the referee before the game. One team can only make a total of three substitutes plus the goalkeeper in each game. This includes overtime, when the players are huffing around on their last legs, about to pass out.
Keywords:  five, match, course, allowed
Five are allowed during the course of a match.