The Portuguese winger has been in fine form this season and there has been reported interest from Spain.
But Gill has confirmed that a new contract offer is on the table and expects no hitches.
When asked if Ronaldo will be at the club next season, Gill told BBC Radio 4's Today programme: "Without doubt, without question.
"He has a three-year contract. He came out in the press and said we had started discussions on a new deal, Alex (Ferguson, United manager) confirmed that and they are ongoing.
"We're not putting a timeline on them - that would not be appropriate.
Reassured
"But every fan can be reassured he will be a Manchester United player for a long time. The contract will reflect his performances for us and his stature in world football.
"It will be realistic to extend his deal by another two years, to 2012, the same time Wayne Rooney is signed for."
Gill was also upbeat about Ferguson's recent claims that he intends to stay on as manager for another two seasons.
"I think we're doing well this season. We've not discussed it but he's done fantastically well and he's on a rolling contract - something we want to go on as long as possible."
The Reds face a European Select XI at Old Trafford tonight to mark the club's 50th anniversary in European competition and the signing of the Treaty of Rome.
Gill added: "We're very proud to welcome UEFA and the European community to Old Trafford.
"Quite a few people have dropped out through injury but we have a great cast list.
"There will be (Marco) Materazzi of World Cup fame, Steven Gerrard and Jamie Carragher of Liverpool, Juninho from Lyon and Henrik Larsson - who had a great spell for us - playing for Europe."
How long do you think Ronaldo will stay at United for? Have your say.
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Deepaw, MD, USA (13/03/2007 at 09:31)
Steve in Brussels (13/03/2007 at 10:38)
Frank Old Trafford (13/03/2007 at 11:16)
stu, london (13/03/2007 at 11:44)
Keane was right Sell Ronny (13/03/2007 at 12:46)
Reds4Ever, West Yorkshire (13/03/2007 at 13:34)
SAFs RedKnight, Manchester (13/03/2007 at 13:46)
13/03/2007 at 12:46".... I see they medication your on is a bit over strength, ring the doctor mate and have a word.
Jonny F, Chorlton, Manchester (13/03/2007 at 14:45)
TMUF, Manchester (13/03/2007 at 15:06)
Jimmy the Red, Winnipeg (13/03/2007 at 15:17)
Whaley Bridge Cynic (13/03/2007 at 17:14)
Steve in Brussels, none (14/03/2007 at 13:48)