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However, it was Toulouse who took the lead just before half time, as Trejo headed in to score his first goal for his new club.
Martin Braithwaite came close to doubling the visitors' lead early in the second half, but his right-footed strike was comfortably saved.
Toulouse continued to create the majority of the chances, but it was the hosts that claimed the second goal of the match, as Oniangue beat Ali Ahamada with a drilled effort from 20 yards out.
The visitors reclaimed the lead with less than five minutes left, after Clement Chantome was brought down in the box, resulting in a red card for Antoine Devaux, which allowed Braithwaite to score from the spot.
Braithwaite almost added a third for Toulouse moments later when Issiaga Sylla slotted the ball back into the box, but was unable to get the better of Agassa again.