The Magpies were ahead at half-time, but a second half collapse, hastened by a Hammers penalty, saw Steve Bruce’s men lose their first game of the season.
The Toon boss was still encouraged by some elements of his side’s display though.
"I don’t think there was much wrong with us offensively but it’s getting that balance right, isn’t it?
“As soon as we chased the game, we left ourselves exposed and open and you can’t afford to do that at this level.
“The referee’s decision to give the penalty... I understand the first instance – I’ve got no complaints about it, the attacker gets the benefit of the doubt.
“But I don’t understand the rule why the referee can’t just have a look at the monitor himself.
“I think if he had done that, after looking at what I saw four or five times, I think he might have turned around and said it was a bit harsh.
“That is the big turning point in the game. Unfortunately, we’ve given away too many soft goals.”
The 60-year-old confirmed he planned to pay a visit to referee Martin Atkinson after the game.
He added: “It is the turning point. In the Premier League, it’s fine margins.
“I have to say, the spectacle for an hour or so was very, very good.
“Once we went chasing the game., we made it very difficult for ourselves with Antonio’s pace.”
We’ve gathered the best of today’s Premier League speculation below…

5. Leeds back in for Nandez
Leeds United could be about to re-launch their bid to sign Nahitan Nandez from Cagliari after his move to Inter Milan hit the buffers. Contact has been made once again between the Whites and the 25-year-old, and a deal could be struck (Tutto Mercato Web) (Photo by SILVIO AVILA/AFP via Getty Images) Photo: SILVIO AVILA

6. Gunners linked with Conte
Antonio Conte has been linked with a move to Arsenal after the Gunners lost their opening league game of the season against Brentford. (Tuttosport) (Photo by Mattia Ozbot/Getty Images) Photo: Mattia Ozbot

7. Bamford on Spurs radar
Tottenham Hotspur want to sign Leeds United striker Patrick Bamford this summer. (Telegraph) (Photo by Lynne Cameron - Pool/Getty Images) Photo: Pool

8. Battle on for Hughes
Crystal Palace are now hoping to beat Newcastle United to the signing of Watford midfielder Will Hughes before the transfer deadline. (The Sun) (Photo by Richard Heathcote/Getty Images) Photo: Richard Heathcote

