I don't think that Rashford presence in Barcelona will affect any of their current players, because Flick already know the formation and tactics to use. Players will be rotated which is a norm. In the long run, the best performing players will always be among the first eleven. Rashford should try his best and cope with Barcelona system for easy adaptation and to win a place in Flick's first eleven.
Agree. We have seen that Hansi Flick is not very interested in Rashford. Barcelona management was interested in buying Nico williams. But in the end Barcelona can not able to bought Nico . Even Barcelona brought Rashford to the squad because Barcelona did not have to spend any extra money. If Manchester united offered to sell rashford, I think Barcelona would not buy him. So we will not see any changes in Barcelona's Starting XI because of coming to the Rashford Squad. Flick will not make any changes to Barcelona's formation, match strategy and starting XI like we saw in the last season