Two foreign players are allowed per team, plus 1 more from the ASEAN partner country of J. League.
The matchday roster will consist of 16 players, and up to 5 substitutes will be allowed in a game.
If either or both top 2 finishers are ineligible for promotion, the playoffs and/or direct exchange will not be held in accordance to the exact positions of promotion-eligible clubs.
Note: Flags indicate national team as has been defined under FIFA eligibility rules.
2015 J2/J3 Play-Offs (2015 J2・J3入れ替え戦) Machida Zelvia was promoted to J2 League.Oita Trinita was relegated to J3 League.