The 26-year-old leaves Barca after 124 first team appearances in the three years since he joined them from Portuguese giants Benfica.
Kepa is under ever-increasing pressure after making the latest in a series of errors in Chelsea's 2-0 defeat at home to Liverpool on Sunday.
Four minutes later it was 2-0 after Mane slotted the ball home after a terrible error from Chelsea keeper Kepa Arrizabalaga, whose attempted clearance was blocked by the forward.
Other measures include the reduction of stakeholder personnel attending the Games by 10 to 15 percent, streamlining transport services, adjusting spectator activities at competition venues and hosting a number of pre-Games meetings online.
Health Minister Olivier Veran on Wednesday said that a new limit of 1,000 people will be imposed from Saturday at big events in several regions amid growing COVID-19 concerns, which included Paris.
The players are due to be tested again on Monday before a decision was made about their availability for the match.
Media reports speak of deep divisions between him and his players.
In Sunday's only other fixture, Vasco da Gama missed the chance to stay in touch with leaders Atletico Mineiro after a 1-0 defeat at Coritiba. Robson Fernandes struck the winner from the penalty spot in the 90th minute.
Leverkusen had the last chance on target but substitute and new arrival Patrik Schick was unable to beat Casteels with a header with seven minutes to the final whistle.
"Petr was important in that because goalkeeper is a very particular position. Petr Cech was the best in the world in that position for a long time, so he's obviously had a big say in this situation," explained Lampard of the former keeper, who in 2004 also joined Chelsea from Rennes.
LANZHOU, China, Sept. 26 (Xinhua) -- The Silk Road 2020 International Mountain Bike Race concluded in Jiayuguan City, northwest China's Gansu Province on Friday.