According to Sean Dyche's tactics video it's the Jeff Hendrick role. Seems he prefers to play 4-4-1-1 against the top sides. Has to break from the front of midfield to pick up Calvert-Lewin's knock downs. Could be Onana or Maupay?
It will be interesting to see. It's probably tempting to use Onana in that role because I think he can have a big impact further up the pitch. But with the way Gana and Doucoure have been playing and with Garner getting back to fitness, I think we really need him to play in a double pivot further back.
I'm not sure that Maupay is particularly well suited to that role, but Dyche may appreciate his tendency to be a pest.