In 2016, Bennasser joined the Red and Whites in a five-year deal from Nancy and was sent back to the Ligue 2 club temporarily for the 2016-17 campaign.
The following season, the midfielder was loaned to Caen where he managed 29 appearances across all competitions last term.
On Monday, the club presented reinstated players and new-signings to the media and Aït Bennasser disclosed his feeling as he prepares to feature for Leonardo Jardim’s men this season.
“Very happy and proud to start my adventure with Monaco,” Ait Bennasser tweeted.
They visit Bordeaux for their next league fixture on Sunday and the Atlas Lions midfielder will hope to grab some playing time.