I hope if (and it's a big if), Koeman does put him in, that both the manager and fans allow him a run of games to actually show what he can do. I think he's got a lot of talent, but it can't be underestimated how hard it is to instantly make an impact when coming in to the side for 1 game.
I've already seen a few people being critical of him on various forums, although I know most are in agreement that he should be given a chance. But he needs time to show what he can do, and it's so frustrating that Koeman hasn't given him a chance yet, and will also deem him not ready if he doesn't make a massive impact in one game.
The whole point i've made above is pointless anyway as the clueless manager in charge won't pick him as no team actually needs wingers to play on the wing in his mind. We need centre midfielders or strikers to play there instead and make zero contribution lol.