It'll be rolling subs soon, like in youth football...or American Football. Not long until teams will have a specialist free kick taker, who will come on to take the kick, then be subbed back off again.
So let's not get rid of Holla just yet...
And this meant that if a player was injured, the team was down to ten men. In an era when it was hard to get booked, let alone sent off, hatchet men were worth their weight in gold.
To answer the question, though, I think three named substitutes, all of who could be used, is sufficient - plus a...