Bayern Doctor Hans-Wilhelm Mueller-Wolfahrt confirmed that Robben, who missed the first half of the Netherlands' World Cup campaign with a hamstring problem, has suffered a muscular tear in the same thigh on Tuesday morning, according to Bild, something that has since been confirmed by both the player, and the club.
Speaking to the club's official website, Robben admitted his surpirse at the setback.
"This diagnosis is a shock," said the 26-year-old. "I felt fit, made four World Cup games and felt no more pain."
Meanwhile, chairman Karl-Heinz Rummenigge was less than pleased with the news, citing the failings of the Dutch national team.
"Once again we have to carry the bill for a national team and an incorrect diagnosis. We are terribly disappointed."
The Netherlands winger had earlier admitted that he still remains haunted by what could have been in South Africa, after he missed a golden opportunity against Spain in the World Cup final.
Robben received a well-weighted pass from Wesley Sneijder in the 62nd minute and had only goalkeeper Iker Casillas to beat, but was denied by the Spaniard's foot after hesitating.
Spain went on to win the match 1-0 in extra time with Andres Iniesta scoring a late winner, and Robben admits he is partly at fault for his side's loss in the final.
"I think very much of it. I had the best chance in the game," he told SPOX.com. "The ball was perfect, it's my fault.
"A great chance to win a World Cup final does not come often - maybe it never will again."