David Nalbandian has undergone hip surgery and is expected to be out of action for at least four months.
The world number 15 would miss Argentina's Davis Cup quarter-final against Czech Republic in July and would play no part in the year's remaining Grand Slam tournaments, the Davis Cup website (www.daviscup.com) said on Saturday.
Nalbandian picked up a hip injury at the Barcelona Open last month. He lost in the first round of the Estoril Open on his return and underwent surgery in Barcelona earlier this week.
He will remain in Barcelona until the end of May before returning to Argentina to continue his recovery.
