Farage has in the past kept his distance from National Rally (RN), the successor party to the National Front (FN), formerly led by Marine Le Pen.
Le Pen was banned from public office for five years in March after a conviction for embezzling EU funds, barring her from standing in the 2027 presidential race.
She has condemned the verdict as a "political decision" and plans to appeal, with a court due to rule next year.
As leader of Ukip, Farage kept his party out of an alliance with the FN in the European Parliament.
But writing in 2017, he endorsed her to win that year's presidential election, praising Le Pen for reshaping the party, adding that under her leadership since 2011 it had become "about sovereignty, not race".
His Brexit Party did not rule out entering the same group as the rebranded RN after the European Parliament elections in 2019, but ultimately decided not to join the group ahead of the ejection of the party's MEPs in 2020 in the wake of Brexit.
However he criticised her party's more interventionist economic policies last year, saying they would be a "disaster" for France.