Roman Abramovich's attempt to sell Chelsea has been halted after the oligarch was sanctioned by the UK government as part of its response to Russia's invasion of Ukraine.
The freezing of Abramovich's assets, which include Chelsea, means the club cannot sell further match tickets.
The move is intended to stop Abramovich making money from Chelsea.
The government has issued a special licence that will allow fixtures to be fulfilled, staff to be paid and existing ticket-holders to attend matches.
Season-ticket holders can still attend games for which they have tickets but the club cannot now sell any more tickets.