London - England fullback Mike Brown has been ruled out of this weekend's Six Nations clash with Ireland in Dublin after failing to recover from a concussion in time, head coach Stuart Lancaster said on Wednesday.
The 29-year-old was carried off on a stretcher early in England's 47-17 victory over Italy on Feb. 14 after his head was struck by Andrea Masi's shoulder.
Brown took part in light training with the England squad on Tuesday but failed to pass Stage 3 of the return-to-play concussion protocol ahead of the trip to Ireland.