Owen Farrell will depart Racing 92 a year before the end of his contract in order to return to Saracens immediately.
England internationals Kyle Sinckler and Lewis Ludlam will join Toulon next season, the French club's president Bernard Lemaitre said.
France centre Jonathan Danty will miss the rest of his country's Six Nations campaign including matches against Wales and England after being given a five-week ban.
England international Lewis Ludlam will leave Northampton at the end of this season ahead of an expected move to France.
Stuart Lancaster has confirmed Racing 92 are interested in recruiting Owen Farrell from Saracens but no deal is yet done.
The premier club competition in rugby returns this weekend in the form of the Champions Cup, but it does so in a new format.
Henry Arundell will be available for England in 2024 Six Nations, despite joining French club Racing 92, due to the 'special circumstances' rule.
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