Cape Town - Queens Park Rangers manager Harry Redknapp has bemoaned Sandro's "stupid injury" which the midfielder sustained in a training ground celebration.
The £10 million off-season signing now faces an anxious wait to learn the full extent of the injury, but will almost certainly miss Saturday's crunch clash with high-flying Southampton.
And having suffered from serious knee injuries in the past, Redknapp has lambasted the Brazil international for his unnecessary celebration.
"It was a stupid injury," said Redknapp.
"He scored a goal in training and slid on his knee like a lot of players do. I don't know why players do it.
"The pitch was bone dry so he skidded. His knee has gone bang into the turf and I watched him trying to get up wondering 'what's he done here?' Sure enough, he wasn't fit for Saturday.
"I couldn't believe it. He had a knee operation at Tottenham last year which kept him out for quite a while.
"It was a setback for us and I wouldn't recommend anyone sliding on their knees. It's absolutely crazy."
Queens Park Rangers travel, without Sandro, to St. Mary's Stadium to tackle Southampton on Saturday, September 27 at 16:00.