PSG has announced the signing of Dortmund centre-back Diallo for 5 years.
"It is a great honour to be involved with such a prestigious club as Paris Saint-Germain," Abdou Diallo said after signing his contract.
"I have always said that the Parisian project was very attractive. Joining the capital club today is another important step in my career. I am committed to giving my all for my new club and look forward to bringing my qualities and desire to this team renowned for its high quality and high ambitions."