In your opinion.. was he at his best under Tuchel, Lampard or Sarri?
Individually I think he was at his best in Lampard's first season, which would be Kovacic's second season. His partnership with Jorginho in the pivot was unreal that season. The team was set up a bit in a way that got the best out of him.
He brilliant under Tuchel too but I think when everyone was fit Tuchel preferred Kante and Jorginho over him. But in big games, he always stood up, especially vs Liverpool and Spurs. He loves playing against them.