Capable of playing any position across the back row, he has brought intensity and 100% commitment every time he has worn the Gloucester shirt.
He spoke about his reasons for his return to Sixways:
"I've enjoyed every minute of my time at Gloucester, it's been a great club to play for. The highlight would probably be winning the LV= Cup in 2011.
"However, it's an opportunity to go back and play for my home town club. It's a challenge, but I was impressed with Dean Ryan's plans for the future and I've also worked with Hoggy (Carl Hogg) before.
"I'd like to thank everyone at the club for making my time at Gloucester so enjoyable, and I'll be doing everything to ensure I finish on a high here."
21 year old Mills, a former England U20 international, is a product of Gloucester's Academy. He was part of the England U20 squad who won the 2011 Six Nations Grand Slam and who reached the final of the Junior World Cup that year, as well as featuring in the equivalent 2012 squads.
A player of undoubted potential, he missed several months following knee surgery in the summer of 2012 and is currently sidelined with a broken metatarsal. Having made his debut in 2010-11, he has made 19 competitive appearances for the club.
Mills explained that it hadn't been an easy decision:
"Deciding to leave has been an incredibly tough thing to do. I've had a great few years here at the club and learned so much from so many different people.
"It's been frustrating to have missed so much time due to injury, but I'm almost back now and really need to start playing week in, week out. I feel that Worcester offers me a better chance to do that.
"For now though, I just want to get back on the pitch and play my part for Gloucester for the rest of the season."
Director of Rugby Nigel Davies praised the duo for their contribution to the club and wished them both well.
"It's the nature of the modern game that players move on to other clubs. Both Matt and Ryan are quality individuals who have contributed hugely to the squad in their time here.
"It's a shame to see them leave, but I do understand their reasons for doing so and, on behalf of everyone, would like to wish them well in the future."