The biggest weakness I can see with this 3-4-3 is the space in behind the wing backs. Because both of our wingbacks aren't fantastic defenders, if you've got that space and you've isolated Moses or Alonso and are a decent dribbler, you should be able to exploit it, and then you can exploit further by either putting in a good cross if no support comes in, or having another player attack the channel that is left behind by the support player if support does arrive. It's something that could be a problem against City specifically since they like their players underlapping and moving in these channels and spaces.
It'll be interesting to see how Conte deals with this if it gets properly exploited.