The relegation-threatened club have confirmed that matter will be dealt with "internally" after a photo on the 33-year-old's Instagram account was circulated on the internet
The shot-stopper was attending the fancy-dress celebrations with his wife Susana Werner, who opted to upload the photo in Cesar's personal Instagram account before being quickly deleted.
|10/3||QPR are 10/3 with Paddy Power to be winning at half-time and full-time v Reading
"The image, which appeared on an Instagram account, has since been deleted. The club will be dealing with this issue internally."
Cesar joined the Rs from Inter in the summer but, despite a string of impressive performances, has been unable to prevent the London side slipping to 19th in the Premier League standings and a candidate for relegation
Saturday's 2-0 defeat to Stoke City leaves QPR ten points adrift of safety, knowing a loss to 20th-placed Reading on Sunday will see the club drop back into the Championship after just two years in England's top flight.