Substitutions were first allowed in English league matches in 1965. Just one, and for injuries only.Before their introduction, any injury could have a serious effect on the outcome of a game.Leicester City found that out to disastrous effect in the 1961 FA Cup final, when Len Chalmers broke his leg 20 minutes into the 2-0 defeat to Tottenham.Leicester would benefit from this rule in the third game of the 1963-64 season, when a serious injury to Arsenal goalkeeper John McClelland would cast...
