The popular 34-year-old joined Worcester in 2002 and is now set to clock up over a decade of service at a club where he has become a star performer in the pack.
And Gillies has revealed how pleased he was to become the latest player to agree a new deal, following in the footsteps of rising scrum half star Ollie Frost in agreeing a new two-year deal.
"I was very happy to have the contract offer for a new deal at the club, I have been at Worcester for a long time and I never wanted to leave," said Gillies, who has so far made a record 226 appearances for Warriors.
"The new contract will take me past a decade at Warriors and that is a long time. But my family are very settled in Worcester and we love it here.
"I really feel part of the club and a great deal of loyalty to Worcester. The club has been very good to me, Cecil Duckworth in particular with the way he has continued to back us all.
"It fills me with pride to have been at the club for so long. I never thought that I would be looking at ten years with Worcester, but I am so pleased to be looking at achieving that achievement now.
"I'm delighted to be able to continue my association with Warriors, there has never been an issue when I have been offered deals. I always wanted to stay.
"The body still feels good. Hopefully I have got a few more years and I have two more now to target and, who knows, even more after that."
Head coach Richard Hill has heaped praise on the form of Gillies this season that has seen him become one of the key players in the pack with 13 appearances and one try against Doncaster Knights.
The lock admits he has relished the new approach to the game brought in by the Sixways boss, even if he remains modest about his own displays.
Gillies said: "We have a positive approach to our rugby and that is because of the way Richard Hill wants us to play.
"I felt like I had a very good pre-season and at the start of the season I felt I was in good form. An injury on the opening day which set me back a little bit, but now I have had a run of games I feel I am getting better.
"I'm never totally happy, my wife always asks me every week how I played and I normally pick on the negatives. But I am reasonably pleased with how I am going so far.
"The team has started to develop and started to get real momentum going. We have put some good performances together away from home - Doncaster Knights and Rotherham were certainly good displays.
"It's been a lot of highs and lows during my time at Sixways so far," he added. "When I joined we were in the old National Division One and it's where we find ourselves now, but there is no doubt the club has evolved and got better.
"The aim this season is to get promoted back to the Aviva Premiership. That is the target for me and for everybody at Warriors.
"Having signed a new contract I am looking long term, but first and foremost is this season and we have to concentrate on the big goal ahead of us and how we want the next few months to go.
"After six years in the Premiership we want to get back there and we want to establish ourselves. But first up is this season - no one is looking any further than that."
Gillies is all set to run out again this Saturday in front of his huge fan base at Sixways as Warriors entertain Bedford Blues in a big RFU Championship clash.
And the Glasgow-born lock revealed his determination to bring success back for the avid supporters who have stuck by the club in recent times.
"We have a superb set of supporters up at Sixways who have stood side by side with us through the good and bad. They are right behind us and have always supported me - I can't thank them enough for that," he said.
"It's been frustrating at times to be out there not playing the rugby we know we can produce. But hopefully this year we can repay them and get promoted back to the Aviva Premiership, really give them something to cheer about.
"There is no better sound to me than a full house at Sixways and that roar when we are turning over one of the big boys. The fans have been great to us and with this new contract I want to help us get back to those big days on home soil."