Di Matteo has taken to enjoying the odd cigarette or two after winning in the Premier League as he bid to cleanse the club of its yo-yo promotion and relegation image.
"Our pressure this season is to get rid of the yo-yo reputation of the club," said Di Matteo.
"We got promoted last year which was a hell of an achievement but the fact this result was against Arsenal probably ranks high up there in terms of results.
"Usually I smoke one cigarette after a game but after Arsenal it was two. It just gives me four or five minutes to collect my thoughts. Obviously I do not smoke in the stadium as it is not allowed."