Premier League referee Jon Moss has reportedly been threatened with legal action after injuring an assistant referee during a kickabout last year.
John Flynn, who has previously run the line during the FA Cup final, has been out injured for 15 months after being tackled by Moss during a session at St George's Park.
According to the Daily Mail, Flynn has been seeking advice from lawyers, having failed to secure an appointment for a fixture so far this season.
The Professional Game Match Officials board, who investigated the incident at the time, insists that Flynn is yet to pass a fitness test.
