Arsenal have some problem to solve, and Nketiah or Havertz will become the replacement to help Arsenal through the start of the season. Gabriel Jesus is too injury prone and cannot be a reliable player for Arsenal for the many games they have next season in all the competitions. It will be good for Arteta to get used to bringing him in as a substitute player so he has lesser playing time, and lesser injuries. Since no new striker will join them, Arsenal need to give the fittest and less injury players in striking position more playing time to get fit, so their striking power and ability to score goals is not reduced anytime Jesus gets injured.
If that is the case, Arteta needs to check the transfer market and look for a good striker who can stand for Jesus and be an alternative to Nketiah, because I don't think Havertz will be a good alternative for that position. If we have to check Havert's record when he was striking for Chelsea last season, he was not performing to my satisfaction because he is not a striker. The best thing Arteta should do is get a striker because trying to manage only Nketiah will never make sense because anything can also happen to Nketiah also, despite the fact that we know he is a strong player. The season is starting with a few days to go and many competitive games to play, especially in the Champions League, and this time around, fans will not play as the beginning of the season's Arsenal performance was not good.