Sadly, first thing we'll do when the January window is open is sell Barkley. They were trying right until the last minute so I can't see that changing unless the money on offer has become peanuts now.
Only slim chance of keeping Barkley would be if Koeman went and we got in a manager like Tuchel who could sell him on staying around. Even so, it's unlikely as why would he not go to Spurs at this point? Or Chelsea for that matter.