The only ones in the past 10 years I can think of are Bailly Cargill from Bournemouth who was average at best when we got relegated from the Premiership and is now at Forest Green and George Moncur from West Ham who we only played a couple of times and now is in the Championship with Hull.
Possibly Max Melbourne from West Brom too who was horrendous but not sure if they were in the Premiership or just relegated at that point.