Manchester United have the excuse needed to dive into the transfer market late this window and agree a late deal. All month long, it has seemed Manchester United were content to sit still and would not be strengthening in this transfer window. Yet that was how it had appeared late last January, when the club had appeared to wrap up business in the first few days of the window, with Jack Butland and Wout Weghorst brought in. Then there was an incident late in January which acted as a trigger for a dramatic deadline day move for Marcel Sabitzer. Anthony Martial situation repeats Christian Erikse…