South African duo Cronje and van der Merwe have become key figures in the Racing pack and have been rewarded with new three-year deals.

Flanker Cronje, 28, has made 71 appearances for the Parisians since 2009, having previously played for the Bulls, Lions and Biarritz.

Van der Merwe, 27, made the switch to Racing from the Stormers in 2008 and he has played 81 times.

Argentina international Imhoff is in his first season at the club, with the 22-year-old winger having scored six tries in 16 appearances.