Despite being linked with a hosts of Ligue 1 clubs, notably Bordeaux, Lille, and Monaco, on 12 July 2007, it was confirmed that Matuidi had agreed to join Saint-Étienne after agreeing to a four-year deal with the club. Upon his arrival, Matuidi was given the number 12 shirt and was inserted into the starting XI, where he established midfield partnerships with Loïc Perrin and Christophe Landrin. He also formed a bond with former and fellow Troyen Bafétimbi Gomis, who had a breakout season.
Despite being linked to various Ligue 1 clubs, including Bordeaux, Lille, and Monaco, Matuidi ultimately joined Saint-Étienne on July 12, 2007, signing a four-year contract with the club. Upon his arrival at Saint-Étienne, he was assigned the number 12 jersey and integrated into the starting lineup alongside Loïc Perrin and Christophe Landrin. He also formed a connection with fellow teammate Bafétimbi Gomis, who had a standout season.