London Welsh forward Greg Bateman and centre Hudson Tonga'uiha have signed new deals with the Premiership club.
Both Bateman, 23, and Tonga'uiha, 29, helped the side to promotion from the Championship last season.
Exiles head coach Lyn Jones said: "I'm absolutely delighted that Hudson and Greg have committed themselves to London Welsh.
"These two re-signings signify the ambitions and long-term objectives of the club."
Jones continued: "Hudson has really stepped up to the mark this year and has thrived in the Premiership.
"Greg has grasped his opportunity with both hands and is evolving into a decent Premiership player with the potential to go further."
Meanwhile, Welsh have announced the appointment of Tony Copsey as their new chief executive.
Copsey, who has held posts at Harlequins and London Wasps, will start the role on 1 January.