Brian O'Driscoll did not train with the Ireland squad today ahead of Saturday's clash with England.
The centre has been laid low with a stomach bug but management have indicated that he will be fit for the game at Twickenham.
Isacc Boss is making all the markers in terms of the concussion protocols so is on course to be available.
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The Leinster scrum-half suffered concussion last Friday during the closing stages of their Pro 12 win over the Dragons in an incident that has earned Dragons prop Francisco Chaparro a 10-week ban for his dangerous tip-tackle on Boss.
Image: Brian O'Driscoll against Wales ©INPHO/Colm O'Neill
