Four-time British and Irish Lions coach Ian McGeechan is among a number of rugby greats who have warned that lives could be lost unless the sport reduces the number of substitutions allowed in a game.

In an open letter to global governing body World Rugby, McGeechan and fellow 15-a-side 1970s stars Willie John McBride, Gareth Edwards, Barry John and John Taylor cite former Lions skipper Sam Warburton's words in 2019 that someone "will die during a game in front of TV cameras" if nothing is done.