Cameron Johnston's NFL season with Pittsburgh could be over after just one game, with the Australian punter appearing to suffer a serious knee injury in his Steelers debut.
Johnston, who joined Pittsburgh from Houston on a three-year, $9 million deal, was hurt in the season opener when he collided with an Atlanta Falcons defender during an attempted punt late in the fourth quarter.
His foot was stuck in the ground and it led to his right leg twisting awkwardly.