Sam Allardyce has called for Giovanni Trapattoni to make a public apology to Steven Reid for comments he made about the Blackburn midfielder.
The Republic of Ireland manager has expressed doubts about whether Reid will ever fully recover from the knee injury that has restricted his involvement with Rovers in recent times.
Allardyce believes it is completely wrong for an international boss to make such remarks that might affect the confidence of an individual.
"The sad thing for me from the international scene is the very disappointing comments from Giovanni Trapattoni about Steven Reid," Allardyce said on Sky Sports News.
"I think it is disgraceful that a manager from an international side comes out with such drivel and such nonsense.
"I think he should make a public apology to Steven and this football club for trying to undermine one of our contracted players who has had some really hard times recently trying to overcome this injury."
Reid stressed earlier this week that he had not fallen out with Trapattoni and still had ambitions to return to the Republic side.
But Allardyce does not understand why Trapattoni chose to attack one of his own players, especially when his comments were not even accurate.
"To actually wake up and see that written in the paper from the manager of his country is particularly disappointing and I think he was completely out of order," said Allardyce.
"He was totally wrong with his statements, that is not the case with Steven, and it is very damaging for a young man who is trying his best to start playing again, secure a new contract and force his way back in the Republic of Ireland side.
"I find it totally amazing he came out with what he did."