What changes could Barcelona make to their squad for the next season?

Forwards:

Messi and Suarez -the Dream Duo

Messi and Suarez have been working a lot this season. Their telepathic connection will be trusted again for the next season. There were rumors about Barcelona looking to replace Suarez with Griezmann. Some would like this idea but breaking such a connection is not particularly advised. Griezmann is a top-notch player but will require a lot of time to settle in the team. Messi and Suarez have 55 goals and 21 assists combined in La Liga. Surely both of them have had a good season individually too.

Paco Alcacer has not shown much improvement since previous seasons. Although he has scored 4 goals and assisted 3 so far during the unbeaten run, he has been underused this season by Valverde. A team like Barcelona would like to have even better stats from a striker. He was also played in the wide role by Valverde to help out the midfield. He can be loaned out for a season to get more game time to sharpen his abilities

Gerard Deulofeu is on loan at Watford. Some of his performances have been far better than at Barcelona. Deulofeu should be loaned out for another season for further development.

Jose Arnaiz was a bright spark at the Copa Del Rey. The young Barca B striker has been amazing. He bagged 3 goals in 3 games for the senior team in the cup matches too. He should be promoted surely. Being at Barcelona B, Arnaiz will fit in almost perfectly with Valverde's ideas in the senior team.

Munir has been great for Alaves while on loan. The decision of sending him on loan has paid off and now it seems the right time to bring him back.

Changes:

Buy: Promote Jose Arnaiz (from Barcelona B)

Sell: none

Loan: Bring back Munir(on loan at Alaves); extend Deulofeu's loan (Watford); Loan out Paco Alcacer.