Kolkata: The concussion substitute rule came into effect just before the Ashes this year, its wisdom immediately apparent when Steven Smith was replaced by Marnus Labuschagne in the second innings of the Lord's Test in August after being struck on the helmet by Jofra Archer.

India have been involved in all four subsequent instances that have necessitated a concussion sub. On a dramatic, action-soaked opening day of the first pink-ball Test in India, Bangladesh were forced to dug deep into their threadbare resources after first Liton Das, and then Nayeem Hasan, had to retire hurt after being pinged on the helmet by Mohammed Shami.