The Bluebirds boss has heaped praise on his captain after he scored the winning goal in the Premier League's first ever south Wales derby, lauding his decision to move from Spurs
|7/1||You can get 7/1 with BetVictor on there being more than 2.5 goals when Cardiff take on Aston Villa
And Mackay has praised the England defender for deciding to leave Tottenham in July in search of regular first-team football at Cardiff, who are 12th in the Premier League following victory over the Swans.
"I couldn't believe we actually got him, not for the price we ended up paying," Mackay told reporters.
"He was very brave to step out of Spurs and walk away from being a squad player and coming over and, with respect to us, dropping down to us.
"But I think he did it knowing that it was with the best intentions for his football career and not his pocket - and I think that gives him great credit.
"It's for the good of his career and his England future and I think he will have a long one. He's here now and he's captain at 21 or 22 years old and playing regularly at a high level to a high standard.
"We knew we had done our homework on him and we were able to go and deal with [Tottenham chairman] Daniel Levy in such a good fashion, who was excellent to deal with, and we knew it was going to be a good signing for us."