Louis Van Gaal insists he was let down by ‘unprofessional’ players at Manchester United.
The Dutchman claims he emailed his stars before one-on-one meetings to help them improve their game.
But Van Gaal thinks some of his squad pretended to read the messages to try and get out of the extra work.
He told Bild: “I developed the digital tracker with my IT man. Each player was able to log in.
“So I gave everyone the opportunity to prepare for the conversation with me at home and to meet me in dialogue at eye level.”
Asked if any players just pretended to read his messages, LVG explained: “That’s true, too. But this testifies to their unprofessionalism and I have then addressed them.
“But I already did that with the emails at Bayern. My conviction is that a full professional also wants to live professionally.
“Like Arjen Robben. He read the emails.”
Van Gaal was replaced by Jose Mourinho after failing to satisfy the United fans.
And he tried to turn things around by signing Robert Lewandowski – but saw former club Bayern Munich thwart his efforts.
Van Gaal added: “He is currently the best striker in the world. I also wanted to train Lewandowski and wanted to bring him to Manchester United.
“The price was not a problem for Manchester United, but Bayern did not want to let him go.”