I for one, would like Navas to be given a solid run in the team. For 29, he still has incredible pace and there are so many games where pace is completely absent from our line-up, relying on pin-point quick passing. He never stops running, always looking for the opportunity to get in a cross and it all then depends on who is in or close to the box.
My only gripe about him is that he appears to be reluctant to just run at the back four. He could get so many free kicks for us, like Adam johnson used to, and no defender likes those types running straight at them. That is why Real wanted Bale as well as Ronaldo - having the two of them in your face the whole time, must be haunting.
Also, I would put him on the left mainly, but switch occasionally to the right side when needed.
Just his pace for 90 minutes could cause so much damage and like any player, he needs a run to really build confidence.