Top three teams go to Qatar, No. 4 team goes to playoff in June 2022. 2. Tiebreaker.
Overall goal difference, then overall goals scored, head-to-head points, etc. 3. Substitutions.
Five substitutions remain in effect for World Cup qualifying and finals. 4. Yellow cards.
Two yellow cards at any point lead to one-game suspension. 5. VAR.
Concacaf will not use VAR. (UEFA just added it.)