Greig Laidlaw claims Johnny Sexton's absence could be vital as Scots plan to target 'lynchpin' Conor Murray

If Scotland captain Greig Laidlaw is right, the loss of visiting playmaker Johnny Sexton could be crucial to the outcome of Scotland’s game with Ireland at Murrayfield in Saturday’s Six Nations opener. The Leinster fly-half has been struggling with a calf injury and was ruled out on Tuesday, along with flanker Peter O’Mahony, while wing Andrew Trimble remains a serious doubt.