The goalkeeper is the only required position of a team. ... In order to replace a goalkeeper who is sent off, a team usually substitutes an outfield player for the backup keeper (thus effectively the red card and substitution takes out two of the starting eleven players).

Can a goalkeeper be substituted?

A goalkeeper may only be replaced by a substitute (or an excluded player if one team had more players than the other at any stage of the kicks) if they are unable to continue.

Has a goalkeeper been subbed off?

On 21 August 1965, Keith Peacock of Charlton Athletic became the first substitute used in the Football League when he replaced injured goalkeeper Mike Rose eleven minutes into their away match against Bolton Wanderers.