If Porto and Sporting CP do not pay their outstanding debts by the end of next month, they will be barred from playing in Europe for one year.
UEFA announced sanctions against eight clubs on Friday for violating Financial Fair Play (FFP) regulations.
Porto, who lead the Primeira Liga, and Sporting, who are second, have been fined €300,000 and €250,000, respectively, and will be barred from participating in the next UEFA club competition to which they qualify in one of the next three seasons unless they can demonstrate by January 31, 2022, that they have settled "unpaid overdue amounts."
Real Betis have been fined €250,000, while CSKA Sofia and CD Santa Clara have been fined €75,000 each, and Mons Calpe SC has been fined €15,000.
Additionally, all of those clubs risk missing out on playing in Europe in the 2022-23, 2023-24, or 2024-25 seasons if they qualify but do not pay their debts.
FC Astana and CFR 1907 Cluj received fines of €150,000 and €200,000, respectively, but were spared a suspension.
Additionally, the newly established First Chamber of the UEFA Club Financial Control Body (CFCB First Chamber) determined that AEK Athens violated several club licensing and financial transparency regulations.
The Greek club has agreed to make an unconditional financial contribution of €1.5 million and to withhold 10% of any UEFA prize money earned in the next UEFA club competition for which they qualify.