That's according to scans of Japanese magazine Jump (via Nova Crystallis), which say the two games will be included on a single Blu-ray disc.
The Vita versions of Final Fantasy X and X-2 will reportedly be sold separately.
Both games are said to feature the expanded international version content.
Last year, producer Shinji Hashimoto said the Final Fantasy X re-release is a "high-definition remaster" and not a fully remade version of the PS2 classic.
Little has been seen of the project since it was announced last year, but in February Square Enix released a video update showing off some HD character models.