The game between Sydney Thunder and Perth Scorchers was brought to a halt after a scary collision between Daniel Sams and Cameron Bancroft.
During the home team's innings at Optus Stadium, young all-rounder Cooper Connolly skied a ball into the outfield as both Thunder fielders raced to try and catch it.
Neither Sams nor Bancroft saw the other coming and both players dived towards the ball and clashed heads.
"There's been a horrendous collision," Mel Jones said on Fox Cricket.
"There will be some concern here. Both players fully committed to the ball and didn't see each other coming. This is what you don't want to see."
Wide World Of Sports have opted not to show images or footage of the collision.
Daniel Sams and Cameron Bancroft are taken from the field. Fox Cricket
Bancroft was moving around on the turf in agony and clutching at his face, before being assisted from the field by Thunder officials.
Sams laid motionless on the ground after the collision and cameras were diverted away from him as medical staff loaded the left-arm quick onto a medicab.
Fox Cricket reporter Kath Loughnan confirmed at the start of the second innings that both players were conscious in the Thunder sheds, but had suffered concussions and would be assessed for potential fractures or other injuries.
Thunder were forced to scramble in a bid to replace both players as Ollie Davies and Hugh Weigben were parachuted into the batting lineup for the run chase.
