Manchester United captain Roy Keane bowed out of international football on Friday two days after Ireland’s World Cup campaign ended in a match the injured midfielder could only watch.“Like all football supporters in the country I am disappointed that the Republic of Ireland failed to qualify for the World Cup finals,” Keane said in a statement read by state broadcaster RTE.“Much as I would like to continue playing for my country, I feel the time has come when I should retire from international football and concentrate on domestic football for whatever remains of my football career.”Ireland finished fourth in a tight European Group Four after a goalless draw against Switzerland at home. Keane, who broke a bone in his foot last month, did not play in either of Ireland’s last matches. He had always said he would retire after the 2006 World Cup finals in Germany or if Ireland failed to qualify.