The year 2019 is also a big year for those players who return to their former clubs as players or managers. The chart below indicates their stats before and now.
For now, Zidane and Solskjaer have been performed well, as Lampard is very unstable for Chelsea.
Arteta hasn't gained any victory in 2 games so far. Hummels and Buffon are no longer the main force now but they can still contribute power.
As for Zlatan... No more words needed! Let's look forward to him!