The 22-year-old - who captained Wales Under-20s to the runners-up spot in the Junior World Championships in France in 2013 - has made a total of 49 appearances for the Blues.
Jenkins played for all the Cardiff Blues age grades and won the Welsh Championship every year he was in the squad. His performances saw him promoted to captain the Cardiff Blues Under-18 squad and then on to Wales.
But with the likes of Sam Warburton and Josh Navidi for competition, it could have been easy for Jenkins to look elsewhere to advance his career.
"I have been at Cardiff Blues since I was 15 years old and this is where I want to play my rugby under the guidance of Danny Wilson," he said.
"I worked with Danny in the Wales Under-20s set-up and know what a success he was there. I believe that's where we are going and what we can build at Cardiff Blues, given time.
"I have spoken to Danny about his long-term plans and I know the calibre of signings he also wants to bring in to take us forward.
"I enjoy playing for Cardiff Blues, have a great relationship with the fans and I feel this season I have also really stepped up my performances.
"I'm disappointed to not be playing right now because of injury, but I'm looking forward to getting back out there as soon as possible.
"It would have been easy to get up and move on. We have players like Sam Warburton, Josh Navidi and Josh Turnbull in the back row so you are never guaranteed a jersey here.
"But I'm not that kind of person. I have confidence in my ability and to be able to challenge them. They would say exactly the same thing; we all push each other to get better."
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