The in-form West Australian, who has played 90 games for Carlton, insists there was "never any doubt" that he would re-sign with the club that threw him a lifeline by selecting him in the 2007 NAB AFL Draft.
"They gave me the opportunity and I want to honour that and stay here for as long as I can," the 26-year-old told reporters on Monday morning.
In announcing the new deal, Carlton's football manager Andrew McKay said Armfield was highly regarded by the club.
“We’re very pleased that Dennis has agreed to terms for another two years; he certainly adds some speed to our forward line," he said.
“Dennis is also a great person to have around the club. He displays terrific leadership qualities with his active involvement in school and community programs."
Armfield is excited about the prospect of continuing to learn under coach Mick Malthouse, who he credits with giving him more confidence to use his renowned pace.
With Carlton rising to eighth position on percentage, and being one of six teams level on five wins, Armfield says the Blues plan to continue their development against winless bottom side Greater Western Sydney at Etihad Stadium on Saturday.
They won’t be taking the Giants lightly, he said.
"We've taken our time to learn Mick's strategies, so there's no real letting off for us," he said. "We've got to improve each week, so against GWS we've got to improve again …
"We've got to make sure we get as many wins on the board before the (mid-season) break. The ladder's pretty close this year so I think every game's a crunch game."
One area of the Blues' game that requires attention is their conversion, which has been disappointing in recent weeks, and could have cost them victories against Port Adelaide and the Brisbane Lions. They managed 13.20 at the Gabba on Saturday night.
Armfield believes the inaccuracy is a result of players taking their set shots too quickly.
"We're not taking our time. We get the 30 seconds, however we're still rushing," he said. "It was such a hard-fought game (and) I think a bit of pressure maybe got to us, but we'll work on it under game simulation as much as we can out there and look to improve it this week."
One Blue who would help their conversion is Chris Yarran, who has missed the past two games with a hamstring injury. Yarran participated in a light training session on Monday.
He and vice-captain Andrew Carrazzo, who has been sidelined for four weeks with a calf problem, will face fitness tests this week.
Ben Collins is a reporter for AFL Media. Follow him on Twitter: @AFL_BenCollins
