Emerson has joined OL on a season-long loan with the option to buy next June.
The Italy international said, "I am very happy to arrive at OL.
"When the proposal was made to me to join the club, I was very happy. I wanted to help my new club as quickly as possible. OL are a great club, a great team.
"I want to do the same as what Fabio Grosso did and win trophies with this club."
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