Barcelona's Robert Lewandowski was diagnosed with a hamstring injury on Sunday and is set to miss the Copa del Rey final and Champions League semi-final according to Spanish media reports. The 36-year-old Polish forward, Barcelona's top goalscorer with 40 goals across all competitions, came off during his team's 4-3 La Liga win over Celta Vigo on Saturday. "Tests carried out on Sunday have confirmed that first-team player Robert Lewandowski has a semitendinosus injury in his left thigh," said Barcelona in a statement, without specifying how long he would be sidelined for.