Real Madrid right-back Dani Carvajal could be out for up to a month after suffering a right hamstring injury.
"After tests performed today on Dani Carvajal...he has been diagnosed with a grade two injury in the right hamstring muscle," Madrid said in a statement.
Madrid sports daily Marca reported that the Spanish international will be sidelined for a busy month of action for Real.
As well as the Copa del Rey semi-finals, should Madrid overcome a 2-1 quarter-final, first leg deficit against Celta Vigo, Carvajal is expected to miss La Liga games against Malaga, Real Sociedad, Celta and Osasuna.
Carvajal is also now a major doubt for Real's Champions League last 16, first leg clash with Napoli at the Santiago Bernabeu.