Serie A side Lazio have threatened to take legal action against those who question the age of their 17-year-old Cameroonian player Joseph Minala.
Minala, who joined the club last summer was forced to shut down his Facebook profile after suffering abuse and questions over the legitimacy of his age.
In a statement, Lazio said the 17-year-old's birth certificate was "absolutely legitimate", before saying they are prepared to take legal action to "protect the good name of the company and the footballer".
The player also issued a statement on the club's website denying claims that he told a website that he was 41 saying: "It's false statements that have been attributed to me by people who do not know and for whom I reserve every action of damage."
Polish police detained around 120 supporters of Italian football team Lazio after violence broke out ahead of Thursday's match against Legia Warsaw.
Police said bottles and stones were thrown from the Italian group in the direction of police cars.
Lazio are due to play the Polish league champions in a Europa League match tonight in Legia's 32,000 capacity stadium.
Of the 14,000 tickets sold, 750 were purchased by Lazio fans according to the Polish side.
A Tottenham fan is in a serious condition following a fight with masked assailants in Rome ahead of tonight's Europa League match against Serie A side Lazio, police have announced.
He suffered an injury to his artery in the incident, which took place in the early hours of this morning and left nine other Spurs supporters injured.
The group - which included nine British and one American - was outside a pub near the city centre when they were attacked.
A number of Italians involved in the fight were detained, a police spokesman added.
UEFA have announced that they have opened proceedings against Lazio for "improper conduct of the club's supporters" during their Europa League match against Tottenham.
Aaron Lennon, Jermain Defoe and Andros Townsend all appeared to be the subject of monkey chants from the away end during Spurs' 0-0 draw against the Italian side.
A statement read: "UEFA has opened disciplinary proceedings against S.S. Lazio for the improper conduct of the club's supporters (racist behaviour) during the UEFA Europa League group stage match on Thursday 20 September between Tottenham Hotspur FC and the Italian side."