The half-back had just finished his best game in a Suns uniform, racking up 30 disposals, 14 clearances and a goal to guide his new team to their second win of the year, at the expense of the Lions.
Those Lions included former teammate Simon Black who branded Brennan a "mercenary" during the week.
However, a dignified Brennan rose above the war of words, saying he had not spoken to Black, or injured Lion Jonathan Brown, who had said Brennan had held the club to ransom, but would not speak ill of either player.
"I had to bite my tongue a couple of times, I didn't want to discredit any of the Lions," Brennan said,
"I credit a lot to those guys and I wasn't going to come out and bag them."
While Brennan predominantly played defence, he seemed to be everywhere, and his sublime ball-handling skills were complemented by desperate smothers and strong marks (he led the Suns in contested marks, with three, along with Tom Lynch).
However, he said he had not paid too much attention to Black's comments and had not spoken to Suns teammate Michael Rischitelli, another former Lion who had also come under fire from Black, about how they would approach the clash with their old team.
"It certainly didn't spur me on, what did was the chance to get a win, I thought we were a really good chance to win," he said.
"They (Lions players) gave me a little bit of bit of niggle [during the match] but that is footy, I get that most weeks."
The Suns' second win, like their first against Port Adelaide, was not assured until the final siren, although this time they defended a lead, rather than chased one down.
It was also the first win the Suns had at the Gabba and it made for jubilant scenes in the changing rooms after the match.
"It was great, it probably wasn't as over the top as the Port Adelaide win but it was still great," Brennan said.
