I'm looking forward to how they are going to utilize Yamal, Xavi didn't used him like he performed in international games but a mixed up of him and Lewandowski will help the forward maintain a good record in many of their matches this season. Flick should also strengthen his hands to the midfield and not just the defenders and lastly a new goal keeper wouldn't be bad. Sometimes, you don't just go far by scoring goals alone, you need a good goalkeeper to help you maintain a clean sheet.
Lamine Yamal reached his 17th birthday on 13 July mean still young enough for having enough responsibility but still we can say Xavi done good job about his future and give him good opportunities for having experience and improved quality in last season when we have Xavi as coach at the Barcelona he was having 37 appearances, so this is enough for player at this age, but now he is turning into good player which can help his team for having better things in the future.
Flick is surely going to improve few departments of his squad because they needed to done things before start of the season otherwise they can face consequences which could be not ideal for them having strong midfield and defense surely going to help them for having better results against the top clubs as they have some problematic end in last season but still uncertainty around this club for having things not as they required is surely going to hurt them again and fans will also feel not good.