Roy Keane has blamed American investor Ellis Short for his decision to leave Sunderland.
The former Manchester United captain had guided the Black Cats to promotion to the Premier League in his first season on Wearside but grew disenchanted once Short became involved with the club.
Quinn told the Irish Times: "We'd sat down with him (Short) a couple of times, (chairman) Niall (Quinn) and I.
"I went down to London to meet him twice. I thought, hmm, the dynamics are changing here.
"He said he'd read my book. I felt he was thinking from the start that I wasn't for him. He sort of knew this wasn't going to be a long-term relationship.
"It started with a demand to know where I'd been the previous day, that he wanted me available at all times. It was a disappointment.
"Then there were accusations about how often I came in, about moving my family up. And it was the tone.
"There was good spirit among the players. That's what had kept us in the Premiership last year, our spirit.
"So Short's comments got the alarm bells ringing, without a shadow of a doubt. The American fella would have been on Niall's case."