Speaking on talkSPORT, Jordan said: "You embolden these little runts to think they've got a sense of entitlement to say these things.
"The agent is an irrelevance irrespective of whether he's his brother or not. And United as they are have brought this upon themselves.
"We've seen this player before. Pack it in. It's nonsense, you little weakling. Get on with bringing a performance every week.
"This is the club that you've created, United. Now, this is the club that you've got to get hold of. This is what your manager's got to get hold of.
"Get hold of this dressing room, get hold of his group of players and start to get them to operate at a level that's vaguely resembling what Manchester United once were before. This is the culture that you've allowed to generate and there you are. So you reap what you sow."