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Results with national team confirms Chelsea striker has a grade two tear
Chelsea face Diego Simeone's side in match day two of the Champions League on Wednesday
Midfielder says striker will have to improve as quick as possible
British media reported Premier League champions will pay Los Blancos around £70 million for services of 24-year-old
Los Blancos beat Leganes 4-2 on Wednesday to strengthen position on the top
Los Blancos lead second placed Sevillistas Los Rojiblancos by one point
La Roja won 8-0 in opening World Cup qualifying round match on Monday
Celta were without both their top scorers from last season