Sarri praised the spirit of his team.
Chelsea scored the winner in the 87th minute.
Chelsea have taken maximum points from their opening three matches.
‘We knew it’s a difficult game here, especially for us but for every team,’ said the Italian as chelseafc.com quoted.
‘Last season Chelsea, Man United and Arsenal all lost here so I don’t think it’s easy to play here against this opponent.
‘In Italy I’ve never seen Rafa play with five defenders, so low and compact. It was difficult but we needed to move the ball faster and be patient.
‘To be drawing five minutes from the end, it was even more difficult. From the character point of view this is a strong team.’
On Hazard, who was making his first start of the season, Sarri said: ‘I think he played very well, maybe it’s better for him at this moment to only play 70 or 75 minutes but after the first goal Kovacic asked to be substituted, so for me it was impossible to let him rest.’
When asked what he thinks about Chelsea’s position in the Premier League table (joint-top), he replied: ‘Nothing because it’s about 38 matches. It’s important to start very well but now the table is not important.’