Antonio Conte's "iron fist" stopped Eden Hazard from creating problems in Chelsea training and brought the best out of him this season, Frank Lampard says.
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Hazard, 26, was heavily criticised last season as he scored just four times in 31 appearances as the Blues finished 10th in the Premier League.
Although he was linked with a move away, he stayed to become a crucial part of their title-winning campaign under Conte with 16 goals in 36 games this time around.
Conte has received a great deal of praise for winning the league and reaching the FA Cup final in his first season, and ex-Chelsea midfielder Lampard says he has dealt with a troublesome squad.
"Antonio Conte took on a team in a bad place and there were a few individuals who had their worst seasons in Chelsea shirts and he fixed it,’ Lampard told the BBC.
"Mid-season there were rumours that Eden Hazard was being a bit difficult on the training field but Conte dealt with it immediately.
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"He came down on it with an iron fist and then he put an arm around him and that has brought the best out in him."
The Belgium international is contracted to Chelsea until 2020 and says he has not begun talks with the club over a new contract yet.