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.
Other players such as Piccini and Florenzi have also moved on and with no new faces other than returning loanees, new coach Javi Garcia much be wondering what he has got himself into.
Koeman will be keeping his fingers crossed players such as Ousmane Dembele and Antoine Griezmann can up their games, while Francisco Trincao looks an interesting addition in attack. However, the hopes of many fans will now rest on the young shoulders of Riqui Puig and Ansu Fati, who looks odds on to become the new hero of the Camp Nou despite being just 17 years old.
Christian Bassogog tapped in a late goal for Jianye but that couldn't alter the outcome.
The other game on Tuesday saw powerhouse Guangzhou defeat Shenzhen 2-0 thanks to aggressiveness by Brazilian midfielder Jose Paulo Bezzera Maciel Junior who opened the scoring in the 27th minute and contributed an accurate pass to seal the win in the 53rd minute. Enditem
Shenzhen took an early lead in the fourth minute, when John Mary hit the ball into the net after receiving a volley pass from Gao Lin. The Cameroonian striker added his second goal six minutes later thanks to a critical mistake made by Henan defender Han Xuan.
Ygor Catatau struck from the edge of the 18-yard box to give the visitors a two-goal cushion before Babi again found the target by bundling home from close range after smart work from Salomon Kalou.
Latvian runner Dmitrijs Serjogins finished the full marathon first in two hours, 19 minutes and 49 seconds. Lithuanian runner Remigijus Kancys won the half marathon in one hour, five minutes and 47 seconds .
The absence of these key players had weakened Thomas Tuchel's side significantly as the Ligue 1 defending champions launched their title defence with a shocking 1-0 defeat at newly-promoted Lens on Thursday.
"A match like today, I just feel like Pironkova was serving well, she was hitting winners everywhere," Williams said. "Maybe I wasn't being aggressive enough. So I think it's more or less me adjusting my game in the second set and coming back and just trying to do better."
Meanwhile, Nuremberg were able to reduce the arrears in the closing stages when Phillipp Steinhart converted a penalty in the 79th minute.