The J-League has been implementing "extremely strict measures" and limiting the number of spectators to 5,000 for matches after July 10th in order to prevent the spread of the novel coronavirus.

As announced by the J-League yesterday, on the 11th (Friday), for matches after September 19th (Saturday), "the upper limit of the number of spectators will be set at 50% of the maximum capacity under strict precautions. However, for stadiums with a capacity of over 17,000, efforts will be made to gradually ease the restrictions to around 30%."
◇Announcement from J League is here

Based on the J League's official release, "taking into account the local infection situation and stadium shape, the number of spectators and the timing of implementation will be determined by the host club," FC Tokyo will continue to limit the number of spectators to 5,000 in September, and will consider gradually easing restrictions from the home game in October, taking into account the infection situation in Tokyo and the club's judgment from the perspective of the ticket sales schedule.
We will inform you as soon as the details are decided.

To ensure that all fans and supporters who come to the venue can enjoy the game with peace of mind, we will strictly adhere to the league's new coronavirus infection control guidelines. We apologize for any inconvenience caused by measures such as temperature checks at the entrance, but we ask for your understanding and cooperation in strengthening infection prevention measures.

[Ticket Sales for September Home Games]
◇Sep 16 (Wed) Oita Trinita match here
◇Sep 20 (Sun) Vegalta Sendai match here
◇Sep 23 (Wed) Cerezo Osaka match here

◇Guidelines for attending September home games here
◇Regarding FC Tokyo/Ajinomoto Stadium's policy on allowing spectators here