The forward was left out of the starting line-up for United's Champions League defeat to Real Madrid last week, triggering intense speculation about his status at Old Trafford. Although manager Sir Alex Ferguson rejected talk that he was willing to let Rooney leave United this summer, rumours are bound to continue for some time.
Yet Charlton, whose records as top scorer for both United and England are under threat from the former Everton man, said: "I don't worry about Wayne Rooney. There is no way he will ever be allowed to move on, because that is not the way Sir Alex Ferguson works."
He went on: "Wayne has been our regular goalscorer - and he scores fantastic goals. If he scores a great goal, he'll think 'right, I'll get another one'.
"Not only that, he has an influence on the rest of the team.
"Just because he has some competition, I don't think that is a problem."
Nevertheless, there are enough examples of Ferguson ditching extremely high-profile players not to take the status quo as being certain to be preserved.
And even though the wounds are still raw, it would seem the events of last week are likely to fuel the Scot's desire to have another tilt at the Champions League rather than meekly step aside, as some have suggested could happen.
"I think Sir Alex will be there for the rest of time," Charlton said. "He is such an enthusiast for the game. He is a marvellous manager and, whatever happens, he will get the best out of his team.
"What happened against Real will have hurt him a lot but I don't see why we can't win the Champions League again under him, even if it is much more difficult because the opposition is so much tougher."
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