Manchester United defender Eric Bailly's knee injury "doesn't look great", according to Reds boss Ole Gunnar Solskjaer.
The Ivorian came on at half time during their 2-1 victory over Tottenham Hotspur in Shanghai, but had to be withdrawn on a stretcher within minutes of his introduction after appearing to fall awkwardly as he attempted to block a Son Heung-min effort.
Solskjaer told MUTV: "(He) twisted his knee, we've got to do some scans and checks on him. It doesn't look great."
Bailly previously spent six weeks on the sidelines with a knee injury in the 2016-17 campaign before sitting out for over four months the following season with an ankle injury.
Next up for United, meanwhile, is a trip to Oslo to face Solskjaer's boyhood club Kristiansund.