I have my eyes on Pique, Rakitic and Suarez, in this order. Yes, Suarez hasn't been as bad as preached, and did fine in the last games providing danger in the box, but man, he needs to take his chances like a top striker does, or else he'll be blamed and rightfully so. That's the no1 job of a striker. He needs to shoot when in positions to score. Stop looking for Messi all the time like some average players. Amd lose some weight FFS. He's like a bear out there. He can wrestle with opponents just like before, but his finishing and his speed have declined majorly this season so far. That being said, I'm counting on him this season all the way.
Pique is self-explanatory really, right now Umtiti plays like a top 3 CB in the world, and Mascherano is all in as usual, tackling and being the leader we know he is. Pique shouldn't play as a starter if he doesn't get his shit together. 2 of our CBs are playing better than him atm. Unlike Suarez who has no competition, we are doing well in defense, except for his WTF moments. Pique can actually be benched with no problems, since Umtiti - Mascherano is probably our best CB pair at this minute.
Rakitic needs to pick less safe passing options and look to really create when he has a chance to do so, instead of chickening out and passing the responsability to some other teammate. I hate midfielders who lack balls, and he's becoming the personification of that player more and more with each game day.
Sooner or later Messi will have an off day on Camp Nou as well, not only in away games. We need to play well as a team to overcome this situations which will occur with certainty not too distantly into the future.