Franck began his professional career at Narbonne and had two seasons with Stade Francais before joining Bourgoin for the 2011-12 season. He gained his only cap as a replacement when France played New Zealand at Eden Park on the summer tour of 2007.
'I am very happy to sign for the next two seasons with London Welsh,' said Franck. 'I had other opportunities but I decided to stay as I share the same vision as head coach, Lyn Jones, - to secure the long term future for London Welsh in the Premiership - and I am 100% focused on that goal. I love the club, the spirit and the supporters; there is a real family feel. Right now I am happy and proud to be a Dragon!'
Commenting of Frank's contract extension, Head Coach Lyn Jones said, "It could have proved a testing time for Franck adapting to English rugby, but he's taken to the challenge and showed himself as a genuine Aviva standard player. We are delighted to extend his stay here as he will prove a good signing both on and off the field."