Manchester United are interested in signing Chido Obi-Martin from Arsenal. The Nigerian-born striker who represents Denmark at youth level, visited United’s training centre this week. The Gunners remain desperate about keeping Obi-Martin, with first-team manager Mikel Arteta holding talks with the teenager. But Obi-Martin could sign for one of Arsenal’s biggest rivals. According to Academy Scoop, “Manchester United are interested in Danish striker phenom Chido Obi-Martin, with discussions at an early stage. “The record-breaking goal scorer visited Carrington on Tuesday. “Contrary to rumours, n…