Yeah, I think Merino and Sterling will be fine, it clearly takes some time to adjust to our football. Both players depend a lot on intelligence/awareness and will need to have a strong sense for where everyone is on the pitch and where the spaces are.
We need Martinelli to keep improving. He's never going to be great, but if he can be a legitimate starter who scores key goals like today that is going to be an enormous help.
It's that Jesus slot, our second CF, that is the big hole in the squad right now. And I'm not sure it's the type of problem you can solve in January.