Seven candidates will run in next month's French left-wing primaries seeking to win the nomination for next year's presidential election, the organizers said on Saturday.

With President Francois Hollande having said this month that he would not seek re-election, his former prime minister Manuel Valls is seen as the leading contender to win his party's nomination.

The primaries, organized by the Socialist Party, include four candidates from the party, two ecologists and a representative from the Radical Left Party. They will be held on Jan. 22 and Jan. 29, before presidential elections in April-May.