Longstaff struck in yesterday's 1-1 draw at Watford.
Bruce said, “We've got to be a bit more clinical that's for sure but in terms of how we played, we've done enough to win three games in my opinion."
Longstaff's goal was his first of the season, a well-taken curled strike from distance, and he earned praise from Bruce.
He said: “I have to say he's played very very well which I'm delighted to see. So long may it continue.
“I'm really pleased with Sean at the moment, he's playing exceptionally well, as good as he's played since I've been at the club so I'm delighted."
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