While Manchester United have made some undoubtedly excellent progress in the transfer market, further improvements are still required. The signings of Leny Yoro and Joshua Zirkzee have provided a much-needed lick of paint both at the front and the back of Erik ten Hag’s team – while Noussair Mazraoui offers valuable cover in either full-back position – but the lack of midfield reinforcements means this still feels like a sports car with an engine leaking oil. Yes, Manchester United will have Kobbie Mainoo available from the off this time. Toby Collyer looks well placed to make a breakthrough o…