Left Back Left-back (LB) Position A Left-back (LB) or a Left full-back is a full-back defender who is preferably left-footed. A Left-back is usually positioned in the left-side of the field based on their preferred foot. Left-backs usually cover the left zone of the defensive line. See also Full-back Right-back Defender External Links List of LB players in FIFA 20 List of LB players in FIFA 19 List of LB players in FIFA 18