Dembele scored a hat-trick against Brest 10 days ago when the two sides met in Ligue 1 and was simply too hot to handle once again for Eric Roy's side on Tuesday in the Champions League.
The visitors took the lead midway through the first half when PSG were awarded a penalty for handball after Dembele’s shot was blocked. Up stepped Vitinha to calmly send goalkeeper Marco Bizot the wrong way and casually stroke the ball home from the penalty spot.
Brest did have chances to equalise but couldn't convert and were made to pay just before half-time. Dembele was allowed too much freedom down the right flank and continued his red-hot form by sweeping the ball past Bizot at his near post.
Dembele continued to torment Brest in the second half as PSG took complete control of the tie. The former Barcelona star teed up a chance for Desire Doue at the start of the second half, that was chalked off for a tight offside, and then conspired to miss a clear chance after being sent through by Joao Neves.
Yet Dembele simply was not to be denied and added his second of the night on 66 minutes. The former Barcelona star was quick to latch onto a ball in the box and fire home to finish off a great night's work for Luis Enrique's side.