Carter missed Racing's 15-12 defeat to Leinster in Bilbao due to a hamstring injury but could be fit to face either Toulouse or Castres in Lyon on May 26 in the Top 14 semi-final, according to backs coach Laurent Labit.
If not available in two weeks' time, Carter, who will leave the French side for Kobelco Steelers in Japan at the season's end, is "sure" to be fit for the June 3 final in Paris, Labit said.
