Martin O'Neill has insisted he is not concerned by Kasper Hogh's 15-match goal drought, hailing the Celtic record signing's hold-up play in Thursday's dramatic 3-2 Europa League win over Besiktas. Substitute Camilo Duran stole the show with a double that took his tally for the season to 13, but the Celtic boss believes Hogh's display will give him a much-needed lift.