London - England fullback Mike Brown is unlikely to return to action in time for the crucial Six Nations clash against Ireland following a setback in his recovery from concussion.
The 29-year-old felt a recurrence of his symptoms on Friday after being knocked unconscious in the 47-17 victory over Italy and having completed a weekend of rest has restarted the return to play protocols.
The earliest the Harlequins star will be able to resume contact training is Friday, the day head coach Stuart Lancaster announces his starting line-up for Sunday's showdown between the Championship's only remaining unbeaten teams in Dublin.