The game against Villa was Richarlison's fourth in a sequence of substitute appearances which were meant to bring him back to full fitness after suffering an injury in August.
Having played half-hour stints against Manchester City in the League Cup and Crystal Palace in the league, as well as completing a full hour in which he scored against AZ Alkmaar, this cameo appearance seemed to be no different, with Postecoglou making a concerted effort to reintegrate him to the side slowly.
However, this latest blow has left both Postecoglou and the Brazilian striker frustrated. Richarlison has taken part in just 12 competitive matches since March due to various injury layoffs, and he is now set to sit out another lengthy period.