The 18-year-old joined from Auxerre last winter in a deal worth €17 million, including bonuses, but initially signed until 2028 due to regulations governing contracts for minors.
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Having reached adulthood, Matondo has now agreed to the longer deal, as previously planned.
The France Under-19 international made 12 appearances, including eight starts, under Antoine Kombouaré during the second half of last season.
However, his role has changed under Liam Rosenior, featuring in all six opening Ligue 1 matches this term but starting just once.
