Gyökeres had a truly disappointing start to the season with Arsenal. He wasn't effective at all against Manchester United and didn't play well for Arsenal at all. That's why the manager substituted him in the 59th minute. I can't criticize him for that, as he doesn't look ready yet. It seems like it'll take some time for him to get ready for the tough competition of the Premier League.
Gyokeres is a player that many expectations are expected from him and that makes it very observant to everyone when he performs less in any game. This may be his first season and first game in the Premier League which was suppose to be overlooked for him, but he’s blamed by many already that he’s a poor player that can not do well in the premier league. Gyokeres should be giving more time in my own opinion, because I feel he’ll do better with time and have to first understand the pattern of the game before we can rate him again. He will not have a poor stay in this club but he will continue to develop overtime.