It's not beyond the realms of possibility that the midfield suffers injuries, and you'd rather have an England international step in, than have to play an academy player or someone out of position, to cover. Kalvin Phillips could be the player that steady's the ship, keeps the team ticking over during a bad spate of injuries.
The problem with this situation is, I think Pep will player an academy player or someone out of position to cover - it's what he did last season.