Neil Lennon has responded to Gary Breen's criticism of the SPFL on Off The Ball, describing them as 'unnecessary and unfounded'.
Breen spoke to Off The Ball on Saturday about Shane Duffy's move to the Scottish champions, believing that it is a step down for the Derryman.
"This is a brilliant move for Celtic," Breen explained, "but the quality of player he is playing against now will be a big concern for Ireland.
"He is not going to be up against quality centre-forwards. There is no centre-forward in Scotland who would play in a Premier League team. None.
"He is going to be playing against lesser quality and that is a concern."
Lennon hit back at Breen in a press conference before Celtic's match against St Mirren.
"That's just someone who doesn't know the game up here," the Hoops boss said.
"I can give you a list as long as your arm of players who have come up here, thrived and gone on to better things or had a great career while they have been here.
"I think Gary's comments are totally unnecessary, unfounded, there's no sort of substance to them whatsoever and completely wrong.
"I think this will be great for Shane's career, great for his profile - it'll make him a better player and that means a better player for Ireland as well.
"He had a great debut and got better as the game went on so he should take a lot of confidence from that and everyone was delighted for him."