Bape, the top scorer in La Liga this season with 18 goals. Photo: AFP MADRID: Real Madrid manager Xabi Alonso admitted on Saturday that he does not know how long injured superstar Kylian Mbappe will be sidelined. The French striker was diagnosed with a knee strain on Wednesday, which is expected to keep him out for at least three weeks. “We will try to do it quickly, it depends a lot on how he feels, but we will try to get him back as quickly as possible,” Alonso told a news conference. “When is the soonest possible? That’s the question.