The Germany striker joined Frank Lampard’s side in July after Chelsea activated his £47.5million buy-out clause.
Werner had spent four years at RB Leipzig, scoring 95 goals in 159 appearances for the Bundesliga club.
The 23-year-old will make his first Chelsea outing on Saturday in the pre-season friendly against Brighton and says he ‘cannot wait’ to pull on the Blues kit.
He told Chelsea’s official website: ‘I’m very excited. I can’t wait!
‘I was training on my own for a while when I first signed, but I’ve been working with the whole team over the past week or so and it’s been great.
‘It was strange at first [when I arrived] because you just want to work hard, meet all the team and get straight to it on the training field but I had to be patient.
‘I’m very happy that the league starts in two weeks and I’m excited to test myself in the Premier League.
‘I also can’t wait for the friendly game against Brighton, to finally get out there wearing the Blue shirt.’
Chelsea will travel to the Amex Stadium to face Brighton again on September 14 for their first Premier League game of the new season.
And Werner added: ‘It’s a little bit strange to play them twice in such a short space of time but it will be a good test for us.
‘Of course, we want to beat Brighton in both games but today’s game will be a good chance to see how we are performing as a team.
‘It will be a big test but hopefully we can try and beat them today and then again in two weeks!’