"He's got four more years (on his contract) until 2012, he's been with us for five years and we're sure he'll be with us for many years to come. He's clearly one of the best players in the world and he's at a great club, winning trophies.
"He enjoys it immensely here, you can tell that when you speak to him privately. Why would he want to leave? We have no intention of letting him go, we will make sure that he's very happy here, as we do with all our top players."
A report on Tuesday claimed United's debts currently stand at £764million, but Gill is adamant there is no need to generate extra cash.
"Manchester United is not a club that sells its main assets," he told BBC Radio Five Live. "In order to service our debts we need a very successful team on the pitch, and you don't achieve that by selling Cristiano Ronaldo."