Dundee United manager Jackie McNamara spoke to media on Friday, and he slammed Celtic manager Ronny Deila, as reported by the BBC.
McNamara is unsurprisingly disappointed that his star winger Gary Mackay-Steven has chosen to sign a pre-contract agreement with Celtic, meaning that the 24-year-old will run down his contract at Tannadice before leaving for nothing in the summer.
That's a huge blow for Dundee United, and after Deila admitted his interest in signing Mackay-Steven for a fee this month, as reported by the Daily Record, ex-Celtic defender McNamara criticised his Norwegian counterpart.
"He's under contract, he's our player and it's nothing to do with Ronny at the moment," said McNamara. "I've never spoken to Ronny and, as far as I'm concerned, I won't either and that's the way it'll remain."
"I think Ronny has a way of doing things. He's been asked a question by the press. Obviously they've put him in a position about his interest in Gary Mackay-Steven and signing a pre-contract, which is fine, he can do that," he added.
"But in terms of taking him now, that's not within his remit to sign him just now. He's our player unless we decide otherwise."
Dundee United were, according to the Daily Record, ready to sell Mackay-Steven for £250,000 this month, but the way McNamara has reacted to the pre-contract agreement could push that price up higher - but at the end of the day, Mackay-Steven will be a Celtic player in just six months, which is a huge boost for Deila and the Bhoys.
The comments also add another interesting sub-plot to the Scottish Premiership title race, with Dundee United currently lying just one point behind Celtic, which could see a fascinating rivalry between the two managers and ultimately the two teams.