India batsman Yuvraj Singh [Images] was on Wednesday accused of beating up one of his guests during a scuffle at his birthday party in Gurgaon.

Yuvraj, who missed India's tour of South Africa [Images] due to a knee injury, allegedly got involved in a fight with one Siddharth Mahajan during the birthday bash at his residence on Tuesday night. The Punjab left-hander turned 25 on Tuesday.

SSP Hanif Quereshi said medical tests are being conducted on the complainant to ascertain the nature and extent of the injuries. An FIR could be lodged against the cricketer thereupon, he said.

Quereshi said Yuvraj also sustained some injuries in the incident.

Yuvraj's mother Shabnam said Siddharth had come to the party on the invitation of their common friend Sukhwinder.

But Siddharth, apparently in an inebriated state, started abusing the guests and the Indian cricket team, resulting in the fracas, police said.

Siddharth then called up his mother Neelam, who alleged that she reached the spot to find her son being beaten up by Yuvraj, his younger brother and his friends.

Neelam also alleged the cricketer of manhandling her during the scuffle and approached the police.

"My son, who had gone for Yuvraj Singh's party, was assaulted badly. So I filed a complaint with the police and rushed to the spot. When I reached there, Yuvraj Singh and his bodyguards assaulted me and even threatened to kill me and my son. His mother Shabnam and girlfriend Kim Sharma [Images] abused me a lot," Neelam alleged.

However, Shabnam Singh told a television channel that Neelam Mahajan's charges were false.

'She was the one who abused me a lot. We didn't say a word or do anything,' Shabnam Singh said.