Reports have claimed certain individuals at United have become disillusioned by training sessions at Carrington, which have been deemed "old-fashioned".
And some stars are miffed that Rangnick's number two - the inexperienced Chris Armas - has so much influence on sessions.
Shaw told talkSPORT: "There have been a lot of things said about Ralf doing different things, sending people home with homework and the players being angry and unhappy about it, but it is false. Everything is positive here.
"I am really impressed with how he has come in, what he has changed, the details he brings and what he wants the lads to do is really good. Of course, as I said, the team are all together and the team is fully with the manager and his staff.
"Everything that has been written in the media isn't true because I see a completely different side of the team and with the manager inside here than what I read on the outside."
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