Ever since the day Messi left Barcelona, this club has started to decline, they are constantly playing poorly and losing matches constantly. Barcelona may not have won a major trophy since Messi left the club, but arch-rivals Real Madrid have been playing brilliantly. They have even won a few trophies this year including the Champions Trophy.
Actually is not only Barcelona that has been affected by missing those players because even Chelsea and Manchester United ones has a very strong vision team that with there performances the world realized how strong and unique they are from other clubs but now they have nothing to show for it and those titles has become history for them because it will be very difficult or rather impossible to see them coming back to the way they are before, so for now I don't think we should expect too much from Barcelona because there is no amount of player they would have now that would bring back there lost performance so the best they could do now is focus on making the club at least more better than the way it is.