Lyon's football factory is ridiculous, Been saying we needed to raid them and that Umtiti was the man, and Barca came through and got themselves one hell of CB.
Lacazette, Fekir (still a fan, bad injury spells, only 22! watch him come roaring back next season), and obviously Tolisso as you mentioned. Tolisso, whoever buys him, will have found themselves a star. Such a promising CM, who can be both the engine and creative outlet for his team, picks out the right passes and doesn't get dispossessed easily. If he improves his goalscoring output...Jesus.
While my ultimate dream scenario is to someday see Ruben Neves in a Chelsea shirt, Tolisso is another one of the young CMs on that list.