England full-back Mike Brown ruled out of Ireland clash

England full-back Mike Brown has been ruled out of Sunday's crucial Six Nations clash with Ireland due to concussion.

Brown was doubtful for the game in Dublin after suffering a serious head injury during England's 47-17 win over Italy on February 14.

The England medical team had been helping the 29-year-old through concussion protocol before announcing on Wednesday that he had not recovered in time for the weekend.

BREAKING NEWS: @mikebrown_15 is out of the clash with Ireland after not passing stage 3 of return to play protocol. pic.twitter.com/FqDX9f0Zqv

— England Rugby (@EnglandRugby) February 25, 2015

England and Ireland are the only teams left in this year's Six Nations that have won both of their opening two games.