Nelsen was speaking to Absolute Radio's Ian Wright after defeat at West Bromwich Albion.
He said: “...the players are letting the manager down, especially today. We had a game plan and it kind of goes out the window when you give away the goals that we conceded, which is a real shame.
You know, we need to get back to the drawing board... it’s a good time I think for us (the international break), because, now it’s maybe time to really kind of get back and tighten up and really have a good look at ourselves.”
Nelsen was speaking to Absolute Radio's Ian Wright - listen to Ian every Saturday on 1215AM from 5pm. For more, visit absoluteradio.co.uk/football.