St-Pierre last fought in the UFC in 2014 as the welterweight champion, defeating Johny Hendricks at UFC 167. He then vacated the belt and took a hiatus.
The date and venue is to be determined while St-Pierre complies with the USADA protocol.
Bisping, who campaigned and has tweeted frequently on GSP, last defeated Dan Henderson at UFC 204 in his last bout.
It would be a mistake to step into the Octagon with me.https://t.co/yI8H34b1Bo
— michael (@bisping) February 23, 2017
Stay tuned for more on this developing story.