Matthaeus encouraged Schalke not to give up as 31 rounds of matches still remain.
Lenglet's suspension means he misses the game against his former club and highlights the lack of options at the back, where youngster Ronald Araujo is the only alternative to partner Gerard Pique in the heart of the Barca back four.
Slovan's Canadian forward Brendan O'Donnell could have tied the game in the second period but only hit the goal post to go 1-2.
Argentina will face Ecuador in Buenos Aires on Thursday and Bolivia in La Paz five days later.
"I'm very happy. It was a great match, I didn't make any mistakes. Casper is a really great player, very attractive to play, I think there were many good rallies, it was a good match from both of us," said the newly-crowned US open champion.
"We are a new group. I want to help the team get into a rhythm as soon as possible to prepare for tougher matches ahead," Li noted.
With the pandemic under control in China, sports events like the Carnival returned, which in turn gave a further boost for people's confidence across the country to restore normal life.
Sydney FC's head coach Steve Corica said given Le Fondre's great contribution to the club's recent success, it would be wrong to stand in his way.
The seven newest players to be infected include Takashi Ogino, Katsuya Kakunaka and Ikuhiro Kiyota. Marines coach Shota Ishimine and three first-team staff members were also listed among the new cases, Kyodo said. Enditem
In another game on Sunday, Beijing moved past Daqing 87-50. Enditem
In women's action, Petra Kvitova managed to return to the quarterfinals at Roland Garros for the first time since 2012 after a comfortable 6-2, 6-4 dismissal of China's Zhang Shuai in the opening match on Court Philippe-Chatrier on Monday.