"It is impossible at this point to ignore the effect Kai Havertz had on the game against Everton," Nevin wrote on Chelsea's official website.
"He looked like a different player, probably because to some degree, he is a different player.
"The confidence was there, the power that you need at the top level in England was there, though I reckon there is still plenty more to come in that department.
"It didn’t look like one of those one-off performances that any player can have. Against Barnsley, when he scored his hat-trick, it still looked like an indication of, as much as an arrival at, his destination.
"This time it looks more like the real deal."
Kai Havertz has impressed everyone with his performance against Everton and made a serious case to start in the false 9 role for the Blues.
Do you think this is the start of a run of form for Kai?
