The Brazil international has admitted that the Premier League club were interested in his signature but looks forward to playing alongside Zlatan Ibrahimovic in the French capital
The 20-year-old attacking midfielder is regarded as one of the brightest prospects in world football and moved to PSG this month after the club agreed a reported £28.5 million (€35m) fee with Sao Paulo in August.
Sir Alex Ferguson attempted to bring Lucas to Old Trafford but the Brazil international says he was convinced to make the move to Ligue 1 by the former AC Milan player.
"Manchester United wanted me but I talked a lot with Leonardo and he convinced me," he told Telefoot TF1.
"It's an honor for me to play with [Zlatan] Ibrahimovic. I will learn a lot from this side."
Lucas has scored twice in nine Copa Sudamericana games for Sao Paulo this season and his father believes that he has been successful because of his level-headed nature.
"Lucas is a modest kid," said Jorge Moura. "He never lost his head and this is priceless."
PSG sit top of Ligue 1 in the winter break with 38 points, leading challengers Lyon on goal difference.