Franco Mastantuono has admitted a phone call from Xabi Alonso helped him choose Real Madrid over Paris Saint-Germain .

The teenage playmaker was presented as a Madrid player on his 18th birthday on Thursday.

Madrid beat PSG to the River Plate starlet's signature in June, but the Argentina international had to wait until he turned 18 before he could officially join the LaLiga club.

Mastantuono formally signed his six-year contract at Madrid's Valdebebas training ground on Thursday after undergoing medical checks.

He was introduced by club president Florentino Pérez, before posing with his new number 30 shirt and talking to the media.

"[Coach Alonso] contacted me. It was very important for me that the coach showed that confidence in me," Mastantuono told a news conference.

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