The Toffees, who are now managed by ex-Toon Army boss Rafa Benitez, are said to be on the hunt for the academy graduate, who ended last season in Bruce’s starting XI and has played a major role in the club’s pre-season campaign.
The 23-year-old could start Sunday’s season-opener against West Ham United, though Jonjo Shelvey has recovered from the calf injury which saw him sidelined last month.
Bruce, asked about Everton’s reported interest in Longstaff, labelled summer speculation as "tittle-tattle”.
“I think we’ve been linked with 86 players during the summer,” said United’s head coach. “So, you guys have a tendency to go and tittle-tattle about these things when there’s nothing else to write about.
"I haven’t heard anything on Sean Longstaff to Everton. I can’t really respond to that. As far as I’m concerned, nobody’s come to me and mentioned him. I’ve seen it out there on social media, but nothing has come to me.”
Bruce, set to sign midfielder Joe Willock from Arsenal, left the door open for one or more further departures when asked about further signings at his pre-match press conference.
Asked about incoming loans, Bruce said: “That’s an option. Before you bring anybody in, you’ve got to make room. There’s a lot of business to be done. We’ll see what becomes available. I’ll always ask the question – that’s my job.”
We’ve gathered the best of today’s Premier League transfer speculation below…