The QPR midfielder is on-loan to the end of the season.
He said: "I don't know why I didn't play at Fulham, but now I am at Milan where there are many important players.
"My debut went even better than I expected, but I know that I can do much more. My objective is to remain here and get Milan to take up their option on me.
"It was a special feeling to make my debut against Napoli, as I am a great admirer of Diego Maradona, so thinking that I was playing in his home stadium was exciting.
"I've never played in the Champions League, so it will be a truly unforgettable moment."
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