Longstaff, an academy graduate, broke into the Newcastle team earlier in the season, and on debut scored a memorable goal against Manchester United.
He's been a regular in Bruce's squads throughout the campaign, competing against his brother Sean, Jonjo Shelvey, Isaac Hayden and Nabil Bentaleb for a place in the starting XI.
But his contract with the Magpies will expire at the end of the season.
The midfielder has offers from Newcastle and clubs abroad but, after weeks of speculation, is yet to make a decision.
Since the restart of English football, Longstaff has made just two substitute appearances, leading to claims he's being excluded from the team as a result of his contract situation.
Steve Bruce wants Matty Longstaff to stay (Image: GETTY)
But speaking ahead of Newcastle's clash with Tottenham on Wednesday, Bruce dismissed any suggestion that he's deliberately excluding Longstaff and called on the 20-year-old to commit himself to St James' Park.
"This debate that I’m not putting Matty in the team simply because of his contract, it’s not true," he said.
"We’d all like Matty to stay and get things resolved, but the ball’s in his court. But I’m certainly not picking a team with that in mind.
“I gave the kid his debut. He’s had a thigh injury, unfortunately, when he came back from lockdown, which was a pretty severe one.
Matty Longstaff is weighing up his options (Image: GETTY)
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And Bruce is keen for the matter to be concluded one way or another.
Bruce said: "We need all need clarity on that. I do, the club does, everybody does.
"We can then all take stock on that if that happens.
"If it doesn't we just have to prepare the best we possibly can."
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