Pérez hasn't been super impressive to be honest, though playing at Newcastle does him no favors. But if Van Gaal believes he is, or can be good enough to play for United, then that should suffice. He has a good eye for talent, he makes errors from time to time not doubt, but more often than not his assessment is spot on. Not a lot of us were convinced that Martial was the right option for the summer, but he has worked out very well. Van Gaal tried to sign Mané in the summer, and he has taken a step up. Sometimes, it's not about what the player is doing now, but what he could do in the future, under Louis' guidance; and you have to pounce at the right time. If he thinks Pérez is good enough, can develop physically a bit, and has the intelligence to play in his system, then he could be a good option. With Martial looking like our primary #9 for the long term, we do need options off the bench to have an impact over games. Which is what Pérez's role could be. And he's versatile enough to play out wide too.