Scottish star Douglas, who has played 43 times for his country including the 2003 Rugby World Cup and four Six Nations campaigns, has become the latest player to sign up for Warriors and joins Luke Rooney and Andy Goode in making the switch from France.
The Edinburgh-born prop has followed the progress of Warriors over the seasons and got firsthand experience of the club twice this season in the Amlin Challenge Cup.
And the 30-year-old is keen to set about the task of securing a first team spot next term, with an ever increasingly wealth of talent in the front row pool at Sixways Stadium.
"I have seen the new signings, including a few players from the Top 14 in Luke Rooney and Andy Goode, and the squad is really coming together," he said.
"The competition for places in the pack will be really strong and that is great - that is exactly what you want as a professional.
"You need strength in depth in the front row and players who can all play in the top league - there is a lot of rugby in a season.
"I have really enjoyed my time in France and the games in the Top 14, I'm looking to make my mark in the remaining games this season.
"After that it is all about the move to Worcester Warriors. My early career was in England with Harlequins so it's great to come back.
"I have played at Sixways on a number of occasions, most recently for Montpellier this season, and so I know how good the set-up is and how the club has grown. I feel I'm joining at the right time and I'm excited about the future."
