Real Madrid's Alonso unsure of Mbappe absence length
The French striker was diagnosed with a knee strain on Wednesday, expected to keep him out for at least three weeks.
"We'll try to make it happen quickly, it depends a lot on how he feels, but we'll try to get him back as quickly as possible," Alonso told a news conference.
"When is as soon as possible? That's the question. I don't know."
The coach said he hopes Mbappe will be back to take part in the Spanish Super Cup, with Los Blancos facing rivals Atletico Madrid in the semi-final on January 8.