The defender was named as Glasgow Rangers skipper for the 5-0 victory at Ibrox on Tuesday night.
Kiernan was handed the captain's armband by Mark Warburton for the Scottish League Cup last-16 tie and led by example as the Gers thrashed their Scottish League One opponents.
The 25-year-old was a key figure in the heart of defence last season, making 45 appearances in all competitions as the club won the Scottish Championship and reached the Scottish Cup final.
He was rewarded with a contract extension this summer, and it appears as though Warburton plans on him playing a similar role this term.
Speaking to RangersTV, a beaming Kiernan could not hide his delight at captaining the club for the first time and admitted it was "a privilege" to wear the armband.
The former WIgan Athletic man said: "It was probably one of the proudest moments of my career. It was a massive honour and privilege and I enjoyed every minute of it.
"Just before the game, [the manager] came and looked for me and told me, congratulated me and shook my hand. The boys done the same thing so I was looking forward to it.
"It was brilliant. We had to do a job and we done that. We kept a clean sheet, which is always nice, so I am really pleased."
Warburton utilised his full squad for the victory, rotating and handing starts to the likes of Niko Kranjcar, who scored one and set up two more in the win.
Kiernan, though, has already made five appearances this season, consisting of four in the League Cup and playing the full 90 minuted in the Premiership season-opening 1-1 draw with Hamilton at the weekend.