Raiola told Sky Sports in Italy that Pogba is a key player for the Premier League side and is "100 per cent included" in United's future plans.
He said: "Pogba is staying at Manchester United and I think they want to extend his contract.
"He is at the centre of an important project, they will not accept any bid for him this summer.
"Even in the past years Manchester United were never willing to open talks [regarding a move away for Pogba].
"He's not the kind of guy to create controversy. We need to be calm, especially in such a moment, and we'll see how it goes.
"We will negotiate for an extension very calmly, without stress. We will continue our talks."
United finished the Premier League season strongly under Ole Gunnar Solskjaer and Pogba previously described United as a "proper team".
The French midfielder said: "Like I said before, it's about the team. You can call it a proper team.
"Sometimes before, we were maybe too defensive or too offensive and we didn't have this balance or this control; now you can see we have that balance and there is more structure and we've been working hard on that.
"The improvement is huge and you can tell that. It's always good to have that improvement, but you don't want to stop it, you know you have to keep working.
"There is a lot of stuff to do, we are not there yet but we are on the way, and if we keep doing what we're doing now, then I think there is nothing that can stop us to get to where we should be."