Sheffield Wednesday look set to add a 12th signing to their name before the summer transfer window closes. Sheffield Wednesday completed the signing of Shea Charles on loan from Southampton earlier this week. It’s Danny Rohl’s 11th summer signing at Hillsborough and ahead of the August 30th deadline, it looks like the Owls are keen to see what final bits they can do in the summer transfer window. A defensive midfielder has long been on Rohl’s wishlist, and that gaps now been plugged by Charles. Another priority for the Owls manager is a new striker; Brighton’s Mark O’Mahony was linked but he’s…