Saracens' Mako Vunipola is tackled by Sale's David Seymour and Laurence Peacre. Photo: Reuters

England prop Mako Vunipola in doubt for Six Nations due to knee injury

Saracens forward picked up injury in a European Champions Cup clash against fellow English side Sale last weekend

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Saracens' Mako Vunipola is tackled by Sale's David Seymour and Laurence Peacre. Photo: Reuters
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