The 23-year-old's current contract expires at the end of 2025, and it is well known that Red Bull have previously approached him to partner Max Verstappen.
However, with the McLaren team once again showing promise, their upturn in fortunes could be enough to keep the talented youngster beyond his current deal.
Stella explained, though, that in order to sign Norris to an extension, McLaren must continue to give him reason to trust they will deliver upon their promises.
"While as far as the issue of trust is concerned, we try to do the facts," he added.
"We certainly expressed our affection [for Norris] in terms of the 'human' element, as a team you can wish to have with you along the way, especially when the journey is so difficult. But we also need to talk about facts.
"For example, what are the foundations for the future so that we can have confidence in us? With Lando we are doing exactly the same thing, trying to demonstrate as much as possible on the track what we say in words."
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