James Hook has signed for Gloucester after invoking a relegation release clause from French Top 14 club Perpignan.
The 28-year-old Wales playmaker is understood to have completed a three-year deal after being pursued by Gloucester's chief executive Stephen Vaughan this summer.
However, Hook does not know who will be in charge of the Cherry and Whites' playing staff next season with the club still seeking a new coaching unit after rugby director Nigel Davies was sacked.
He will tour South Africa with Wales before assuming Gloucester's frontline fly-half duties from next season.
Hook joined Perpignan in 2011 from Ospreys, but decided to leave after the Catalan club suffered Top 14 relegation this term.
"I was fortunate to have a number of options, but what stood out for me when I spoke to Stephen Vaughan was how much Gloucester wanted me to be part of their plans," said Hook.
"They have huge ambitions and made it clear to me the role they wanted me to play in that.
"The talent in the squad is terrific, the training facilities are top notch and it's a wonderful area for myself and my family to settle in. And I had a taste of the Kingsholm atmosphere last season when I played here for Perpignan. That was phenomenal and I can't wait to experience that again.
"I would like to thank everyone at Perpignan for the past three years, which have been memorable. It's very disappointing to see the side relegated, but I'm sure they will bounce right back and I sincerely hope they do so.
"However, I'm absolutely delighted to be embarking upon the next exciting phase of my career as a Gloucester rugby player."
Unseated Kingsholm boss Davies had signed Edinburgh and Scotland half-back Greig Laidlaw to replace Leicester-bound Freddie Burns as Gloucester's first-choice No 10 for next season.
The British and Irish Lions tourist is now expected to feature more prominently at scrum-half, as he does with Scotland, with Hook shouldering the outside-half burden.
Hook can operate at full-back and centre as well as fly-half, but despite that versatility the 75-cap international has never quite nailed down one favoured role at either club or Test level.