In an interview with FFDream.com, a French Final Fantasy website back in 2013, Motomu Toriyama, the director of the Final Fantasy X series revealed they were about to make a prequel for FFX but the idea was scrapped and probably won't happen. Read the full quote below thanks to @BousfHearts.
"When we created a follow-up to FFX in the shape of FFX-2, it was a really good story with 3 girls that set out on an adventure. We had had that idea and we wanted to make a different one with Braska, Jecht and Auron. From the group of characters preceding X to the new generation after X. So if we made it, we'd have to create the point of departure, a prequel with all the men and women who grew at that time. That would take a lot of work. It was a good idea and we were about to make it but ultimately the idea was scrapped, so there probably won't be a prequel"
In an interview with FFDream.com, a French Final Fantasy website back in 2013, Motomu Toriyama, the director of the Final Fantasy X series revealed they were about to make a prequel for FFX but the idea was scrapped and probably won't happen. Read the full quote below thanks to @BousfHearts.