Sampdoria forward Fabio Quagliarella says Antonio Conte's training sessions are "back-breaking," but added that the Chelsea manager is a tactical genius.
Quagliarella worked under Conte at Juventus between 2011 and 2014, winning three straight Scudettos together.
While it was a successful time, the former Italy international said it was also a gruelling time with Conte one of the most demanding coaches he has ever worked for.
"With Conte, it was back-breaking both in training and in games," Quagliarella told Mediaset television. "The intensity was so high, and you could see that also in our games.