Forget about long term issues with Gomez, he is going to be a great defender for us for years to come. I believe he will show his true form at some point this season.
Until then, it is a worry - both he and VVD have been off their games since we won the title, but VVD will always be the last to be dropped so it is Joe who may make way for Matip if a change is made.
I think Joe will get the next two games to sharpen the partnership then, as the games ramp up, Matip will be rotated in but who plays the majority of games will depend on how they react.
The midfield need to be doing their jobs mind.