Arsenal coach Arsene Wenger has said he will be forced to search the transfer market for a central defender this month after losing Mathieu Debuchy to a dislocated shoulder duringSunday’s 3-0 win against Stoke City. Wenger insists he would have sought to bolster his defensive options anyways, but that the fresh injury suffered by Debuchy and the ongoing ankle problemsuffered by Kieran Gibbs has added urgency to his search.