Don't think Navas did much against West Brom (much down to him cutting back in again and again). However I do think that he creates a certain threat in the oppositions mind even when he isn't playing well, they try to double team him which opens space up for the other players to move in. That being said he did play 90 against West Brom and 75 against Swansea so I think Milner will get the nod, also Saints are a quick team who close down amazingly well so will need a work horse I guess.