Weir, 55, left the Seagulls in September, ending a six-year affiliation with Brighton, and was spotted with Chelsea co-owner Behdad Eghbali two weeks later.
The two watched on as Chelsea lost 2-1 to Man United at Old Trafford, with speculation mounting whether the former Scotland internation was set to join the West London club.
Instead, Weir has signed for sister club Strasbourg as their new sporting director, the latest BlueCo addition to come from Tony Bloom’s Brighton.
Marc Keller, President of Strasbourg said: “I am delighted with the arrival of David Weir, which is in line with the work undertaken to strengthen the club’s overall sporting structure.
“He is a respected professional who brings valuable expertise from the highest level. His experience and competence will be important assets in supporting Racing’s sporting progress and supporting Liam Rosenior and his staff.”
Weir added: “It is a great honor to join Racing, a historic club with a strong identity and growing ambition. I was convinced by the project and the quality of the people already in place.
“I am eager to settle in Strasbourg and become fully involved in the life of Racing. I look forward to working with Liam and all the teams to contribute to Racing’s success this season and in the years to come.”