Basel twice came from behind to earn a 2-2 draw with Nancy in Group E.
Carlos Kim broke the deadlock with the opener for Nancy on 31 minutes, but Basel hit back within a minute with Scott Chipperfield finding the net.
Two minutes later Nancy restored their lead with Pascal Berenguer scoring for the French side.
Basel replied for a second time with Australian international Mile Sterjovski netting on 56 minutes.
The home side ended the game on a sour note when Franco Costanzo was sent off in the closing stages for a professional foul.
The point leaves Nancy second in Group E, while Basel sit in fourth with just two points from three games.