It marked a fourth consecutive loss for the Toon.
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Guimaraes posted to social media afterwards: "Happy to be starting a match again after a long time out.
"I’m not yet at my best physical level, but we’ll get there. I think today the desire to win was there, and I believe we deserved more.
"We know we haven’t been good enough this season, and that’s something that really frustrates us and something we should have improved a long time ago.
"Four games left for us to finish as best as possible."
The result leaves Newcastle in 14th place on the Premier League table.