Former Chelsea manager Andre Villas-Boas has described last month's departure of Jose Mourinho from Stamford Bridge as "quite incredible".
"It's been quite incredible to see that [being dismissed] was applied to everybody," Villas-Boas told beIN Sports.
"It was applied to probably their dearest coach, their most successful coach, so in the end we have seen nothing different. Roman has sacked basically every coach that he's had.
"It's no different. It happened even to the best. The same criteria that he has applied to me, for Rafael Benitez, for all the other coaches, (Carlo) Ancelotti, he's applied to Jose as well."
Villas-Boas, 38, is now in charge of Zenit St Petersburg, but he is going to leave the Russian side at the end of the season.