Arsenal defender David Luiz says he made up his mind to leave Chelsea after a "real honest conversation" with Frank Lampard.
The Brazilian moved from Stamford Bridge to the Emirates for a reported £8million fee on deadline day and was handed his debut in the Gunners' 2-1 home win on Burnley on Saturday.
However, the 32-year-old confirmed he is relishing the new challenge ahead of him at the north London club.
"I am a guy with ambition and that is why I moved," David Luiz said as BBC Sport reported.
"This is what gives me oxygen and gives me motivation and also to really enjoy this moment.
"But I like a new challenge and new things in my life.
"I am trying to be first honest with my heart and honest in the way that I try to feel new things."
David Luiz who won the Champions League, Premier League, the FA Cup and the Europa League with the Blues added: "Everyone knows I was so happy at Chelsea and won many trophies there.
"I had a real honest conversation with Lamps, and Lamps had different ideas for his plans for the year.
"So the best way for me to respect the club where I can was to move on and try to do a new challenge and give him the opportunity to do his job.
"I am so happy here [at Arsenal] as since the first day I felt welcome.
"This is a big club and I want to be here and see it shine – on the pitch and outside."