#3: Antoine Griezmann
2018 FIFA World Cup winner Antoine Griezmann has had a below-par debut season in Barcelona. Neither Ernesto Valverde nor Setien counted on him as much as he would have hoped for.
He was exiled to the bench during most of Setien's Barcelona stint. However, Koeman could have him as a main goal threat as Luis Suarez's time at the Camp Nou seems to be drawing to a close.
#2: Frenkie de Jong
Frenkie de Jong should be delighted at the prospect of his national team manager taking the hot seat at Camp Nou.
The youngster has not fulfilled his true potential since making an €75 million move from Ajax last summer. He has shown glimpses of his true worth, but under Koeman, De Jong could fathom a bigger and more prominent role in the Barcelona playing XI
#1: Miralem Pjanic
Amidst the chaos in the aftermath of Barcelona's dismal 2-8 loss against Bayern Munich in the Champions League quarter-final, many people have forgotten that Miralem Pjanic is now a Barcelona player.
He could bring some new ideas and creativity in the Barcelona midfield, which is struggling at the moment. The former Juventus midfielder could help Ronald Koeman rejuvenate Barcelona in the middle third of the pitch.