Former Atletico Madrid and Chelsea defender Filipe Luis put Flamengo ahead with an eighth-minute strike and Barbosa doubled the lead with a powerful finish after Muriel Becker parried away a free-kick.
Meanwhile, Nuremberg were able to reduce the arrears in the closing stages when Phillipp Steinhart converted a penalty in the 79th minute.
The defeat means Fulham have now lost a record 11 consecutive London derbies in the top flight.
Athletic's pre-season has been hampered by six players testing positive for COVID-19 and injuries to others such as Yuri Berchiche, Inigo Martinez and Mikel Vesga and coach Gaizka Garitano could give minutes to impressive youngsters Unai Vencedor and Jon Morcilla, while COVID-19 also deprives Granada of veteran signing Jorge Molina.
"I'm really proud and happy to become a Paris Saint-Germain player. They're one of the major clubs in Europe today, confirmed by their run to the Champions League final last month," said Florenzi to PSG's official website.
Brighton coach Graham Potter earned praise for his style of football and Adam Lallana's arrival from Liverpool should add guile in midfield, while Crystal Palace remain in the safe but unspectacular hands of Roy Hodgson and their future could depend on what happens with want-away striker Wilfred Zaha.
Nathan Ake has been brought in to give more options at the back, but Guardiola's plans have been somewhat frustrated by new Spain international Eric Garcia's refusal to sign a new contract, and he could be Barcelona bound, while John Stones and Nicolas Otamendi are not reliable enough over a long season.
Cheptegei is already the 2019 men's 10,000 world champion and world cross country champion.
PSG on Friday also announced to have signed right back Alessandro Florenzi on a one-year loan from Italian Serie A club Roma, adding that they have a purchase option when the loan ends next summer.
ACCRA, Sept.11 (Xinhua) -- The Confederation of African Football (CAF) will hold presidential and general assembly elections on March 12 next year in the Moroccan capital Rabat, the continental football body announced late Thursday after an executive committee meeting.
Suning extended the lead eight minutes later with a free-kick from Eder Martins.