The national rivalry is even more intense in the longer distances, where Kenya and Ethiopia are likely to dominate and will happily use team tactics to achieve individual glory.
In Beijing the two countries won every men’s race above 400m, including the marathon, while East African women triumphed in the 800m, 1500, 5,000 and 10,000 and took silver in the steeplechase and marathon.
Somalia-born Farah is hoping to become the first European 10,000 metres champion since Italy’s Alberto Cova in 1984.
His chief rival, world record holder Kenenisa Bekele, is seeking an unprecedented hat-trick over the distance having also won the 5,000 four years ago.
Farah won the world title at 5,000 last year having been edged out on the line in the 10,000 and both men could double up again in London, the 10,000 coming up first.