Phil Parkinson says Wrexham must get "back to the basics of defending" after his side shipped five goals against Southamton. The Red Dragons dropped out of the Championship play-off places as a result of Tuesday night's 5-1 loss to the Saints - who leapfrogged Wrexham into sixth after securing a fourth successive Championship win. Wrexham boss Parkinson says his side need to drastically improve defensively when they return to action against Birmingham City at St Andrew's on Sunday (12:00 BST).