I'd like us to play all of them. KWP and Perraud as full backs, Livramento in a three with JWP and Romeu with S. Armstrong (if fit) in front of them. Adams and AA upfront. Especially against Man City. A 4-3-1-2 formation.
I've only seen the highlights but from what I saw he had a good game. Attacking he looked very good and he made a couple of good interceptions. If he could stop committing rash fouls then he could do well as full back cover. It seems Ralph wants the full backs to be very attacking which would work to Djenepo's strengths.
Everton away is quite a good fixture. They have a new manager with less time to implement his ideas and Everton fans who think their team is better than it actually is. I've seen us lose 3 times at Goodison so I've got very low expectations. It's when I have high expectations that Saints normally let me down. Having Romeu back will make a big difference IMO.