Saracens have signed Wasps number eight Billy Vunipola and Harlequins tighthead prop James Johnston on "long-term contracts" from next season.
Vunipola is one of the most exciting young players in the Aviva Premiership and he has been fast-tracked into England's RBS 6 Nations plans.
The dynamic 20-year-old will join brother Mako at Saracens, who is one of 12 players to have agreed contract extensions with the Men In Black.
While the loss of Vunipola will hit Wasps hard, just as director of rugby Dai Young looks to have finally got the club moving in the right direction, Johnston's departure is a huge blow to Harlequins.
The Samoa international was the cornerstone of Harlequins' title triumph last season and he has developed over the last year into one of the most dominant tight-head props in the Premiership.
England internationals Richard Wigglesworth and David Strettle have also agreed new deals with Saracens along with Saxons squad member Will Fraser.
Eoin Sherriff, Ben Spencer, Nils Mordt, Duncan Taylor, Ben Ransom and James Short have also extended their stays at the club.
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