From the PL, it has to be Koeman.

He seems like someone who doesn't accept any shit. I really like the pressing style he has Southampton, he also had a very respected playing career so I don't think we'd have to worry about potential signings not wanting to play for him.

From outside, I think we should be having words with Simeone. He's a bit of a nutter but his Atleti team are difficult to play against, if we had any of their traits we'd be walking this league in the same way Chelsea did last year.