The ridiculous comments here because of a conceded goal.
For one, this was always going to happen at some point in time. Defending set pieces is always a going to be a weak spot. Doesn't mean he's not good enough. Secondly, this goal wasn't even conceded because of his height. When he saw Toney was going to head that ball from the corner, he decided to move backwards to cover the goalline at the far post. Because he made that choice, he was then caught out of position when the ball went square rather than towards the goal.
Sure you can say he might have made the wrong choice defending the goalline there. I think he was simply in a bad spot in which he needed to make a choice and in the end it didn't turn out well. Nevertheless these things happen all the time at many clubs and in this goal the situation where Toney is matched with Eriksen and then gets an easy header is the bigger problem at this conceded goal.
Other goals Martinez wasn't to blame at all. Also the last one it was Maguire that was supposed to be marking Toney, but he let him walk away from him and then Martinez had to try to close down that space which obvoiusly was impossible at that point. Maguire should have been staying with Toney there, so Martinez could have covered the area in the middle and taken out the cross.
People that are now saying that he won't be playing as a CB anymore are fooling themselves. EtH was very well aware that United would concede some goals from set pieces and also probably a few goals becasue of Martinez' height. Martinez wasn't signed to be a defender that never concededes a goal from set pieces. That would of course be nice, but EtH knows full well that will never happen. Martinez is suppose to be there to help United become a more comfortable side in possesion and help United defend away from the own box. He has shown at Ajax that he can do that, but obviously the team is not in the right shape.
People calling fro Martinez als DM are just being stubborn. EtH has been clear about that. Maybe there's an argument to say that United isn't ready for Martinez as CB yet. However, the quesiton is if EtH can build the team towards where he wants to go without Martinez at CB. How is he suppose to build the team he wants without the CB that he can eventually take him to what he's aiming for. I think it's a difficult one.
I'm pretty sure Martinez will play CB again next week. The question is if it will be with Maguire of Varane next to him.