Stamford Bridge has become the first English top-flight stadium to host standing fans in almost 30 years when Chelsea faced Liverpool on Sunday.
Chelsea are one of five clubs who were approved to trial safe-standing areas during the second half of this season.
It is the first time fans have stood at a game since laws came into force in 1994 stipulating stadiums in England's top two tiers must be all-seater.
More than 12,000 safe-standing spaces have been created at Stamford Bridge.
The sections, which will be in place for home and away fans at the trial venues, give fans the option to sit or stand, with a seat as well as a barrier running between rows.