Chelsea and Aston Villa have been fined by Uefa for breaching the European governing body's financial rules.
The two clubs could be prevented from registering new players for Uefa competitions for the forthcoming season unless they have a positive transfer balance by the end of the summer transfer window.
Chelsea have been fined 31m euros (£26.7m) and could be fined a further 60m euros (£51.2m) if they do not comply with the rules in the next four years.
Villa have been fined 11m euros (£9.5m), with a further 15m euros (£12.9m) conditional on compliance in a three-year period.