Reigning Solo Champion Guy Martin is out of next week's Southern 100 meeting at Billown.
The popular rider escaped with relatively minor injuries after a high-speed crash at Ballagarey during last month's Senior T.T. race.
Despite wanting to make his comeback as quickly as possible, he has decided to accept medical advice and withdraw from the event.
The 55th Southern 100 meeting starts with a practice session on Monday evening.
Shooting: Winter series gets underway
Ward, Berg and Parr lead the way
Cycling: Bostock nominated for national champion of the year
Manxman one of six riders on British Cycling shortlist
Football: Railway Cup hopefuls all maintain pace in premier league
Castletown stay four points clear atop Division 2
Rugby: Vagabonds Ladies stay top with another victory
Vagabonds men and Douglas also take respective wins on home soil