David Nalbandian may need surgery on his right hip and could miss Argentina's Davis Cup quarterfinal against the Czech Republic in July.
Nalbandian withdrew from the Barcelona Open earlier this week, complaining of hip pain.
His physician in Europe, Angel Cotorro, told the Argentine newspaper Clarin that Nalbandian would receive three or four days of treatment including physical therapy and medication before a decision is made on surgery.
Argentina lost the Davis Cup final last year to Spain and is among the favorites to reach the final again with a team lead by world No. 5 Juan Martin del Potro and the 15th-ranked Nalbandian.
Argentina faces the Czech Republic from July 10-12 in Ostrava.
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