Yes, it definitely won't be easy for Flick to make Barcelona that strong again. Because, no matter how great a coach is, how will the club perform without good players? Yes, Barcelona still has other players who are actually quite talented. However, if they want to compete even more closely with Real Madrid and other strong teams in the UCL, Barcelona must try extra hard to make this happen. Because usually, Barcelona is known as the giant Real Madrid and continues to want to compete with that club. Their rivalry is really high. Yes, however, Flick needs a more precise strategy to make Barcelona at least as good as it is with the current squad. And how he can immediately optimize ways to make Barcelona even stronger.
Honestly, no matter how good the coach's reach and club's lack of good players, it still nothing because the coach cannot join them playing the game during match day. The only work of the coach is for him to provide the good players and make sure his players always perform better in every match. Barcelona performance is a little low at the end of this. In this case, we cannot compare their performance with real Madrid performance because real Madrid is far stronger than Barcelona if their coach can look over them and do screening against some players so that he can sign better players that will make the team stronger back.
This is already a different thing. When on the field, a coach will not be in the middle of playing. However, the coach will definitely always accompany them on the edge of the field, observe the course of the match, the performance of the players, and how the moves made by him are carried out by the players, then also formulate various tactics and strategies that are most suitable for the opponent at that time. And moreover, a coach also determines how the players are structured, the tactics used, and the player's goals. It may not be visible directly to kick the ball, but the coach can observe this directly and make decisions if the players do not heed the tactics or directions given by the coach.
The first good news for Flick is about the injured superstar player of Barcelona Gavi.
Gavi was having good days in Barcelona and he had good performances in the games for this team and considering his age, he couldn't have a shining future in Barcelona. But sadly he got injured hardly while he was playing for Spain during the last November, Just after that there was much news about his situation and he had to stay out for 8 to 10 months to get back in the good form again.
While now we have seen some pictures from Gavi training in the field which can show this player can get back to the field and play for Barcelona again.
Yes, at least this is good news for Barcelona. This is one of the long injuries to a Barcelona player. Gavi got injury since November and now he is getting more recovered. After his post-injury training round, it was certain that he could really strengthen the squad next season. but whether it will slightly disturb his performance as before or not. We can see it later. But at least, that Barcelona midfielder is back again.
11 goals and 7 assists in total in the past season and 13 goals in the prior season. He is able to play as a defensive midfielder at the same time. I think he is a wonderful transfer for Girona in short. It looks like they have no intention to have a weaker squad next time. 
