https://www.boxingscene.com/golovkin-lets-face-it-im-40-years-old-nearing-my-retirement--168258
I'm not sure that GGG has no plan of fighting again after this fight but referring to his possible schedule, he already has a lineup regardless if GGG won or lose in this match. His next fight will probably 3-4 months after the trilogy and it was mandated to him by the WBA to fight Erislandy Lara.
Although we can only get an official update about it once we see the result of the trilogy.
And actually, Canelo is not really eager to fight GGG. He is even avoiding GGG for years. But since the community is pressuring him and it's a big money to organize this event, Canelo consider taking the request now to end his chapter with GGG for the last time.
It is indeed big money that he will be bagging again, knowing how fans really wanted both of them
inside the ring again, with what happened to his last fight, he needed something to bring that attention and create noise
with his career, and the good thing, there's GGG who just got from a win who is also eager to fight with him and beat him
the timing is perfect for both fighters.