Britain's Mo Farah will not defend his European Cross Country title in Spain on 9 December as he continues his recovery from a groin injury.
Farah made the 5,000m final at the track Worlds in August
Farah, 24, has also withdrawn from the GB team competing in the Chiba Ekiden Relays in Japan on Friday.
He said: "I'm disappointed, but 2008 is a key year and my preparations for the Olympics have to take priority.
"I'm going in the right direction, but it's important I don't jeopardise that by rushing this recovery process."
Somalia-born Farah plans to spend January in South Africa at the first training Team GB camp of the year.