"Perfect game for Kai today because he came here without hardly any training," Lampard told his post-match press conference. "We had to throw him in because we had injuries in attacking areas.
"Tonight was a great progression, for him to play this game. His work rate, he helps Ross Barkley score his goal, his tackle in midfield in a high area and he gets his three goals in good quality. There's only going to be more of that.
"I predicted it. I wanted to protect him at that point. The idea with Kai tonight was to give him a training session. To not disrespect the game, but for him personally, to see how we play, to work with his teammates, get on the pitch, see how we want to press, be part of that.
"It was a great exercise for him, another game to see how we want to work off the ball, but also have freedom on the ball and combinations with Tammy [Abraham]. It's the first of many great nights for him."