Chelsea manager Mauricio Pochettino has hailed Emiliano Martinez, a player Arsenal sold to Aston Villa three-and-a-half years ago. The Blues were held to a 0-0 draw by Unai Emery‘s side at Stamford Bridge yesterday. Chelsea definitely had chances to score, but Martinez was really good for Villa in goal. Mauricio Pochettino praises Arsenal old-boy Emiliano MartinezEmiliano Martinez was on Arsenal’s books for about a decade. The Argentine spent most of his time away on loan, but he did make his mark in his final year, helping the Gunners win the FA Cup and the Community Shield. Aston Villa then …