The 43-year-old put pen to paper on a two-and-a-half-year deal as head coach, where his first task is to keep the Magpies in the Premier League.
At present, the club is 19th in the table, without a win in their opening 11 matches and five points from safety.
Newcastle are hoping for a new manager bounce but so are other teams around them with Norwich City and Aston Villa also changing their managers during the two-week international.
Here’s where United and their top-flights are tipped to finish come May by data experts FiveThirtyEight – based on current form:
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17. Burnley - 39 points
Sean Dyche’s Burnley are tipped to survive in the Premier League for a sixth successive season. Current points total: 8 points. Photo: Jan Kruger
18. Watford - 34 points
Watford are tipped for relegation, despite a change in manager. Current points total: 10 Photo: PAUL ELLIS
19. Newcastle United - 32 points
On current form, relegation would be no surprise for Newcastle. However, it is hoped Eddie Howe can change that quickly. Current points total: 5. Photo: George Wood
20. Norwich City - 28 points
Norwich are also under new management, with Dean Smith tasked with retaining their Premier League status. Current points total: 5. Photo: Marc Atkins