Players with suspected head injuries can be replaced permanently in Club World Cup games in addition to the team's five substitutes

Pucovski has history of bouncing back strongly from concussion-induced breaks

Chappell rejected banning bouncers but talked about strengthening laws regarding the protection of lower-order batsmen

The run-up to the Test series between India and Australia was marked by a series of blows to the head and concussion-related substitutes, reviving the debate around the use of bouncers by fast bowlers

India's move to use concussion substitution raised eyebrows with many, including in the Aussie camp, questioning the intention and also the qualification for "like for like" criteria

India all-rounder Ravindra Jadeja was replaced by spinner Yuzvendra Chahal as a "concussion substitute" during their first T20I against Australia at Manuka Oval, Canberra on Friday

Yuzvendra Chahal replacing Ravindra Jadeja, who got hit on the head, in the first T20I between Australia and India became a massive talking point

During the 1st T20I between Australia and India, Yuzvendra Chahal came as Ravindra Jadeja's concussion substitute and won the man of the match award

Ravindra Jadeja was hit on the helmet by a Mitchell Starc bouncer. The left-hander then limped off after the end of the Indian innings

Steve Smith was hit on the head during a net session before first England vs Australia ODI. He was also infamously felled by a Jofra Archer bouncer at Lord's during last year's Ashes