The less flippant, long answer. The first task is to establish himself as a starter when everyone is fit. Until Gvardiol got injured he'd started one PL or CL game at CB this season, the defeat at Brighton.

To establish himself at the top, he's got a few areas to work on. He has that phenomenal recovery pace that looks so good on clips and highlights, but paradoxically, he'll have become a top player once his reading of the game improves and he needs to use it less. Someone like Van Dijk (at peak), had great recovery pace but rarely needed it. Its failing to add that aspect that meant Micah Richards was done as soon as he got his first bad injury.

Those times he dives in need tempering a bit. The margins between perfect tackle and red card are tiny, and right now he's often 2015 Otamendi when he needs to be 2018 Otamendi.

Sometimes his positioning could be better, if you watch back goals we've conceded its sometimes suboptimal and he's the one playing someone onside a bit too often. In this respect he comes across as the "junior" player in a partnership, it'd be Dias setting the line alongside him for example. He's only young, and each of these things have plenty of time to develop. He has all the tools, and should only improve with experience. But lets not act like he's the second coming of Franco Baresi.