Rashford hasn't convinced Flick enough for him to start in a match as the season begins and it's going be difficult for Flick to think of picking Rashford over Raphinha who has been an impactful player for his team all last season. Rashford can be given a chance to start in other cup games which might not be much prioritise for Barcelona but in the La'liga and UCL Raphinha will always start and Rashford could come from bench after a few minutes left to play if Barcelona are in control but for now Flack wants to make use of the players he trust to get all the points he needs to start strongly in the new season.
Why should Rashford be considered instead of Raphinha? Raphinha and Yamal will serve Barcelona for a long time. Both players are in very good fitness. Hansi Flick will now have to find a replacement for Lewandowski. Lewandowski's contract with Barcelona is set to expire next season. Also, his fitness is not good enough now. Rashford could be considered as a replacement for Lewandowski. But we have seen that Hansi Flick is willing to use Torres as a replacement for Lewandowski. I would say that Rashford should be given enough opportunities. Rashford should be given a chance to prove his worth.