Arsenal have been charged by the Football Association for an alleged breach of football agents regulations over the transfer of Calum Chambers, the governing body has announced.
The Gunners signed Chambers from Southampton last summer for an undisclosed fee believed to be in the region of £16million.
Agent Alan Middleton has also been charged for allegedly breaching the same regulations over the Chambers transfer.
The full statement from the Football Association read: "Arsenal have been charged for allegedly breaching The FA's Football Agents Regulations.
"The charge is in relation to the transfer of Calum Chambers from Southampton to Arsenal on 26 July 2014.
"Authorised agent Alan Middleton has also been charged for allegedly breaching The FA's Football Agents Regulations in relation to the same transfer.
"Mr Middleton has until 17 June 2015 to respond to the charge.
"Arsenal have until 26 June 2015 after they requested more time to respond to the charge."
Chambers is on the books of Cassius Sports Management, whose head of talent ID and recruitment is his stepfather Steve Moss.
It is understood there is no suggestion of any wrongdoing by the player himself.
Arsenal issued a brief statement in response.
"We have acted in good faith throughout with regard to this transfer," the statement read.
"We are considering our position and will make appropriate representations to the FA."
Reports the transfer was being investigated by the FA following a complaint from a third party first surfaced in February.
At the time, Arsenal manager Arsene Wenger played down any concerns.
He said: "I am very happy about his transfer. I made over 350 transfers since I am here. We have a lot of enquiries about them and we never had any problem."
Chambers, 20, made his debut for the Gunners in the FA Community Shield win over Manchester City at Wembley, and gained valuable experience in both the Barclays Premier League and European competition ahead of a first senior England cap against Norway in September 2014.
The defender was included in England's Under-21 squad for the European Championships, which begin in the Czech Republic next week.