We should go for two midfielders; one to strengthen the team immediately, one for the future. I don't see why we should pay more than 18M for Nolito when we have attacking players like Munir, Sandro and Arda Turan (played as a winger for Galatasaray and Atletico) in our team. Besides that, Barcelona could bring back players like Alen Halilovic and Adama Traoré next summer. Instead of paying millions for a 28 year old player (who's probably at the peak of his powers and won't improve that much anymore) we should give those exceptional talents a chance to prove themselves; if one of those four players (Sandro, Munir, Halilovic or Adama) can play a important role as stand-in for Messi, Suárez or Neymar it'll be worth it.
So instead of paying millions for Nolito, we should invest in a young midfielder like Youri Tielemans or Riechedly Bazoer. Even though Bazoer seems to have lost his impressive form he's still one of the best midfielders in the Eredivisie and deserved his call up for the national team. His best position would be as a defensive midfielder (he played at centre back in the PSV youth academy, but moved to Amsterdam because he wanted to play in a more advanced role). Don't expect a Xavi-esque midfielder, because he's not. He would be an option for the Busquets-role, but everyone knows that we already have a talent for that position; Sergi Samper. So why would we bring Bazoer to the club? I'd rather give Samper his deserved chance than paying millions for Bazoer.
Youri Tielemans is a different kind of player, he is more that Xavi-esque player we've been looking for. His passing and vision are exceptional for his age. Although he is'nt part of the Belgium squad for the games against Andorra and Israel, he could get his first call up very soon. Maybe we could strike a deal with Anderlecht: Tielemans can play for antoher year at his current club (on loan) and will go to Barcelona after that. Sounds good to me!
So apparently Barcelona scouts have scouted players like Pogba, Verratti, Bender, Gündogan, Herrera, Thiago and Koke and already tried to lure Pogba to Barcelona. Ilkay Gündogan is probably the most sensable option, I would love to see Thiago back and wearing that #6.