By Harry Davies Michael Chandler is 100 per cent confident he will be fighting Conor McGregor this summer after their unofficial UFC fight announcement. McGregor claims he will be making his UFC return against Chandler at middleweight on June 29 to headline the promotion’s International Fight Week. The fight hasn’t been made official by the UFC which has led to some fans claiming it won’t take place, but Chandler explained why he thinks otherwise. “I have 100 per cent confidence that I am fighting Conor McGregor on June 29,” he told ESPN. “It’s a crazy sport, injuries and sicknesses happen wit…