Port Adelaide defender Dan Houston has signed a three-year contract extension, keeping him at the club until at least the end of 2022.

The 21-year old was selected at pick number 45 in the 2016 NAB rookie draft has played 39 games for the Power and was recently upgraded to the senior list last month.

"It was an easy decision for me to sign on," Houston told the club website.

"I'm really settled in Adelaide, I've got a lot of good friends here and Port Adelaide has made me feel welcome from day one".

"At the start I had to earn the respect of the players and coaches and work my way up but I have managed to string some games together and now I want to cement my spot, keep improving and become more of a leader”.

Port Adelaide's general manager of football Chris Davies said the club were happy to re-sign the defender.

"Dan is an outstanding person with a strength of character that has endeared him to both his teammates and the rest of the football department," he said.

"As a club we are pleased with his development and we believe he has a long future as a Port Adelaide player."