Bernard Laporte has been taken into custody for questioning by the French Financial Prosecution Office (PNF) on Tuesday.
The vice-president of World Rugby is under investigation for his dealings with Montpellier owner Mohed Altrad.
Laporte is suspected of pressuring the appeals committee of the Top 14 to reduce a disciplinary punishment against Montpellier.
Altrad, the billionaire backer of the Top 14 club whose company's name adorns the France jersey, is also under arrest. He also almost bought Gloucester in 2017.
Serge Simon, vice-president of the FFR, Nicolas Hourquet who is responsible for international relations at the Federation and Claude Atcher who is director general of the organising committee for the 2023 Rugby World Cup.
Sir Clive Woodward selects his Lions 2021 XV
BACK-THREE: Stuart Hogg (Scotland), Liam Williams (Wales), Anthony Watson (England)
"I'd start these three, but could have Jonny May and Josh Adams adding pace off the bench."
CENTRES: Manu Tuilagi (England) & Jonathan Davies (Wales)
"Similar partnership to Te'o and Davies in 2017, but with even more power."
"I don't want to see Owen in the centre, his best position always has been 10. Murray will set the pace with someone like Tomos Williams coming off the bench."
FRONT-ROW: Mako Vunipola(England), Jamie George (England), Tadhg Furlong (Ireland)
"My first-choice front row would be Mako Vunipola, Jamie George and Tadhg Furlong with Rory Sutherland, Luke Cowan-Dickie and Kyle Sinckler on the bench if required."
LOCKS: Maro Itoje (England) & James Ryan (Ireland)
"For me they are the two best locks anywhere at the moment. World-class."
BACK-ROW: Tom Curry (England), Sam Underhill (England), Taulupe Faletau (Wales)
"In the back row I would now start with Tom Curry and Sam Underhill either side of Taulupe Faletau at No.8. Billy Vunipola and Justin Tipuric would have big roles to play off the bench."