"I met a few of the staff and the players I know a little bit from playing. It is a good challenge for me and I am ready for it.
"There are a lot of good players, big players. For me it is the beginning and I have to work hard and prove I can bring something to this club.
"The only thing I can promise is I will work hard and do my best, and hopefully it will be good enough."
There were other offers on the table for Benayoun but he admitted it was a straightforward choice when the champions came calling.
"I had offers from a few teams, but when Chelsea came in for me it was the obvious and only thing to think about, and I am glad it came out in the end," he said.
"I leave a great club at Liverpool and I had a great time there, so I am very grateful to them also."
Chelsea manager Carlo Ancelotti said: "We are happy to have this new player. Yossi has a lot of quality in midfield and can play in lots of positions. I like his behaviour on the pitch and he will do a great job for us next season."
A Liverpool spokesman said: "Yossi's departure was agreed between the player and Rafael Benitez a number of weeks ago. Everybody at Liverpool FC wishes him well for the future."
Benayoun came to England in 2005 when he joined West Ham from Spanish club Racing Santander.
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