Former England international back Olly Barkley has extended his contract with London Welsh.
London Welsh have confirmed new contracts for front-rowers Nathan Trevett, Koree Britton, Nathan Morris and Ben Cooper.
Tom Varndell helped himself to a hat-trick as Wasps registered a 40-13 victory over relegated London Welsh.
Ashley Johnson will make his first start at hooker for Wasps when they visit relegated London Welsh on Sunday.
Ulster have announced the signings of London Welsh players Peter Browne and Paul Rowley.
London Welsh have appointed James Buckland as their forwards coach.
London Welsh will be relegated from the Aviva Premiership at the end of the season following a 29-14 loss to Bath on Sunday.
Bath make four changes to their starting line-up for Sunday's Aviva Premiership trip to winless London Welsh.
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