Both in January. No question.
We have the depth, we have the options especially if Pogba can finally feature for us. Pecking order would be Pogba/Locatelli/Miretti/Fagioli/Paredes and we can use one of the Next Gen mids for Coppa and lower quality league opponents in an emergency.
That's the theory and it's not that I disagree. Giving chances to Fagioli and Miretti should be a priority, both are gems that need to grow and become serious candidates for the midfield.
We don't know about Pogba though and Paredes can't be redeemed, hopefully it's not linked to number of appearances.
In practice I expect Rabiot to remain and Wes to be sold. So something for the club (books) and something for the coach. Especially that we're talking about Rabiot, he can refuse a sale now for better commission and contract in June.