Players' union chief Gordon Taylor believes managers have no right to question the integrity of opposing players.
Taylor has spoken out after Everton confirmed they are to submit a formal complaint to the Football Association following comments made by Chelsea manager Jose Mourinho about their striker Andrew Johnson.
Mourinho questioned the England international's 'professionalism and honesty' after he went to ground in the champions' area during the two clubs' game on Sunday.
Replays appeared to vindicate Johnson, but Taylor, chief executive of the Professional Footballers' Association, believes Mourinho should not have spoken out regardless.
'If we're talking about the FA, we want to make sure managers don't talk about referees and their impartiality, or (make) a judgement on them and their integrity,' he said.
'The same thing should apply to other club's players.
'There are enough people out there, it's part of the controversy of the game, for the crowds (and) the analysts in the media to make comments and judgements.
'But when it comes from within the game and biting at other managers (and) players, again, people in glass houses shouldn't throw stones because it can end up on your own doorstep with your own players.
'I think it's got to be acknowledged a manager is responsible for his own players and it's only going to create antagonism and resentment towards a manager and his players when they hear such comments coming from another manager.'
Taylor added: 'With regards to Andy Johnson, I have always found him a 100% wholehearted, committed player.
'He's a forward, a quick mover and there will be occasions when he won't get a penalty when he feels justifiably he should have got one.
'It (criticism) can be used tactically by managers. Andy is Everton's key player and they are going to make sure before the game there is talk about him possibly going down too easily in the area and then that influences the referee in an unfair manner and can count against the club.
'From my point of view, I think if there's not to be comments about referees there shouldn't be comments about other teams' players. Simple as that.'