Keane was particularly annoyed that the criticism came from a player struggling for form. He noted that Martinez has not been performing at a high enough level to warrant making such bold public statements.
"There will be some fans saying it’s great and some saying you’re letting the team down, especially from a player who hasn’t been at his best, when the team is struggling," he added.
The legendary midfielder also dismissed the idea that the Argentine is a commanding voice in the dressing room. He brutally assessed the player simply as a "centre-half who’s making lots of mistakes."