Claire Rafferty An obvious number 1 choice here.
She has no real competition and has everything you demand from a left back.
Kerys Harrop A great back-up choice for Rafferty has done very well there for Birmingham over the season, has a powerful left foot.
Sophie Perry a solid left back very strong technically and strikes the ball well and can integrate easily in an attacking system/team.
Those are the 3 main choices. I would have had Michelle Hickmott on the list as well but I haven’t seen her on teamsheet for a long time.
Rachel Unitt is not on my list simply because I would only consider her as a center back as she can’t cope with the pace of players like Rapinoe, Thomis or HAO. There are 2 superb prospect in the U19 side Meaghan Sargeant and Alex Greenwood but they are probably a year or two short of experience to compete with Rafferty and Harrop.
The top 2 left-backs make my shortlist.