Sassi joins Tunisian compatriot Ben Youssef at Metz
French side Metz have signed Tunisia's Ferjani Sassi from CS Sfaxien.
The 22-year-old defensive midfielder joins his fellow international striker Fakhreddine Ben Youssef (pictured) at the club.
Ben Youssef (pictured), 23, featured for his country in all six 2015 Africa Cup of Nations qualifiers last year, also joined from CS Sfaxien.
The pair have signed a three-and-a-half-year deals.
The duo helped CS Sfaxien win the Tunisian league title and Caf Confederations Cup in 2013.
Both players have been named in Tunisia's provisional squad for the Africa Cup of Nations, and are expected to join the French outfit after the 17 January to 8 February tournament in Equatorial Guinea.
Metz, who have scored just 17 goals in 19 games, are above the relegation zone in the French top tier only on goal difference midway into the season, with 18th-placed Evian having a game in hand.