The Blues squad returned to London on Sunday and has been training this week.
Di Matteo is pleased with his players’ performance in their pre-season friendly games and is looking forward to a “competitive” fixture against Brighton & Hove Albion on Saturday.
“I think this week has been a good week of training and settling down really, coming back to Cobham and getting rid of the jet lag,” said Di Matteo on the club’s official website.
“It’s been a week of hard work. It takes a few days for everybody to get over it, we all struggled at first but we have recovered well.
“Every day in training is an opportunity, the friendlies are opportunities, and on Saturday I am looking forward to a good competitive game for us and also to test a couple of things, and get some more players with 90 minutes in their legs so that we can get the majority of our players with that amount under their belt.
“That means there won’t be as many substitutions as we have seen in the States.”
Chelsea will begin their Premier League campaign with an away game against Wigan Athletic on Sunday 19th August.