Lampard has insisted he will be counting on the midfielder this season and has revealed his leadership role within the squad.
“The one thing that has struck me about him from working with him in the last week and a bit is not just his quality on the ball, I saw that last year," the Chelsea boss said.
“We know all about his comfort on the ball and bravery to receive the ball in any area. It is not something that's normal to receive the ball in tight areas and deal with the ball and keep doing it constantly.
“But his attitude in training has been first class. He's a driver of a session.
“He's a voice. He runs, he pushes people around him, he drags people up when he doesn't feel they're working as much as he might want.
“I've loved seeing that. So in terms of first impressions, working with him for 10 days, I can't ask for any more. I'm delighted to have him."