The midfielder has joined on-loan from QPR with the option to sign permanently for €7 million.
Galliani said: "I have been tracking Taarabt for a long time, ever since he was playing in the English second division.
"He is a player of great talent and is able to take men on, just the kind of player that I like. Naturally, he is very happy and am seeing him tonight. We are satisfied."
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