The 17-year-old highly-rated defender has agreed a three-year contract with the Parc des Princes outfit, who were anxious to secure his services with several clubs poised to swoop.
And PSG's general manager Phillipe Boindrieux has revealed that last season's English champions and European Cup runners-up were considering making a move for the youngster, who is a regular for the French U17 side.
"It's important for the club to sign Alassane because he's a young guy who is very talented," Boindrieux told the club's official website.
"He may develop at right back or as a central defender. He has been at PSG since 2002, thus doing all of his training at the club.
"Several major European clubs like Manchester United were interested in him. So we are very pleased he's signed as a professional.
"Our objective is now to move forward so he can become a major player in the first team."
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