Winger Michael Tagicakibau will rejoin Saracens from Bristol for the start of the 2013/14 season.
The 27-year-old Fijian international made 43 appearances during a three-year spell with Sarries from 2009-2012 before moving to the Memorial Ground.
Tagicakibau told the Saracens official website: "I've really enjoyed the year in Bristol, but I am excited to be returning to Saracens.
"The squad is going well and Allianz Park looks a special place to play rugby. I'm looking forward to helping the club move forward."
Saracens director of rugby Mark McCall added: "We know Michael very well, and Michael knows us very well, and we're all convinced he has a great deal to offer."