Staunton joins squad for Japan
Staunton, who failed to save Harlequins from Zurich Premiership relegation, has been drafted into the national squad in place of Paddy Wallace.
Ulster fly-half Wallace will miss the three-week tour to the Far East after sustaining a hand injury in Friday's trial match in Dublin. The 25-year-old suffered a broken bone in his right hand just above the wrist.