Barcelona expect Neymar to miss a month with an ankle injury.
Neymar had to be replaced midway through the first half of Thursday's 2-0 Copa del Rey last 16, second-leg win at Getafe.
"Tests conducted this morning confirmed that the player Neymar Jr. has a sprained right ankle," Barca said in a statement on their website.
"The approximate period of time he will be out is three to four weeks," they added.
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