The former Lille star formally signed for the European champions yesterday.
"I watched the Champions League Final like everybody else," he told the club's official website.
"It puts a bit more pressure on the players who are already here but they're used to it, and I think I'm pretty good at coping under pressure.
"It's true that initially there were a number of clubs in for me, but when Chelsea won the Champions League I thought: 'Why not?'
"It was a complicated decision with lots of different factors involved, but the fact that they have great players and are European champions, also coming to London - I know people here already and there are a few French speakers - I think I have made the right decision."