Kieren Fallon has had his bail extended until July as the City Of London police continue their investigation into alleged race-fixing.
The six-times champion jockey was due to answer bail next month along with weighing room colleagues Robert Winston, Fergal Lynch, Darren Williams and Paul Bradley.
Trainers Alan Berry and Karl Burke were also due to reappear but they will not have to answer bail until later in the year. All deny any wrongdoing.
A statement from the City Of London police said: "As a result of a detailed late representation to the Crown Prosecution Service on the part of the defence in relation to this investigation, it has been decided, in the interests of all parties concerned, that full consideration should be given to the issues that have been raised.
"Therefore, bail dates in relation to all 27 people currently on bail have been postponed to July 3rd, 2006."
Fallon was arrested in September 2004 and reinterviewed last October before having his bail extended.
Fellow jockey Gyles Parkin was also among those arrested but he has since been released from his bail conditions without charge.
During the investigation, more than 130 police officers raided 19 addresses across Suffolk, North Yorkshire, South Yorkshire and Hertfordshire. The inquiry is examining allegations involving more than 80 races over two years.