Marseille have 'agreement in principle' for World Cup star Ounahi
The fee for Ounahi, who starred as his country reached last year's World Cup semi-finals, was not made public but media reports claim Marseille will pay €10 million (£8.75 million) for the 22-year-old.
"Marseille announce an agreement in principle with Angers for the transfer of Azzedine Ounahi," the Ligue 1 club said on Twitter.
He is set to become Marseille's second signing of the January transfer window after Ukraine international Ruslan Malinovskyi.
Ounahi featured in all of Morocco's games as they made a surprise run to the last four of the World Cup, becoming the first African and Arab team to reach the semi-finals.
Following his performances in Qatar he was linked with a move to Sevilla, Napoli and Leicester.