Sackey was a Heineken Cup winner with London Wasps in 2007 and has scored 26 tries in 68 European appearances for Bedford Blues, London Irish, Wasps, Toulon and Stade Francais Paris.
The 33-year-old, who has 22 caps for England, arrived in the French capital from Toulon in 2011 and became a regular feature in the side under now-departed coach Michael Cheika.
This season, however, he has started just three Amlin Challenge Cup Pool matches and played less than half Stade's Top 14 games and has yet to score a try.
And it seems former Brumbies winger Francis Fainifo is also on his way out. The 27-year-old has played just five Top 14 games this season.