In the 77th minute of Sunday's clash at Old Trafford, Martinez jarred his knee when trying to beat Ismaila Sarr to a through ball, and was left writhing on the turf in agony. It soon became clear that the Argentine would not be able to continue, and he couldn't even leave the pitch by himself due to the pain. United's medical team stretchered Martinez off and he was moved to tears as he was taken down the tunnel for further assessment, leaving supporters worried that he could now be facing a lengthy spell on the sidelines.