Stephen O'Halloran has agreed to join Coventry City on a one-year deal, with an option for a further year.The Irish full-back will formally become a Sky Blues player on July 1.O'Halloran came through the ranks at Villa but endured a frustrating couple of seasons, which were plagued by cruciate ligament injuries.He battled back and featured for Villa's reserves towards the end of last season - his final appearance coming in the national play-off final against Manchester United at Old Trafford.