Newly-promoted Newcastle are by no means sure to keep hold of their manager this summer, according to Ladbrokes.
Rafa Bentiez has been cut to just 5/2 (from 5/1) to depart Tyneside before the start of next season following a run of bets.
Betting has now also open on potential summer signings, with Jack Wilshere deemed most likely incoming transfer at 5/1 and Newcastle are 6/1 to poach Gibson from Boro as well.
Alex Donohue of Ladbrokes said: "We've opened betting on how the summer will pan out on Tyneside but at the moment the most likely mover looks set to be the manager.
In terms of transfers in, we'll be watching the Wilshere odds closely as plenty of punters fancy him to head to the Toon over China."
Ladbrokes latest bettingTo sign for Newcastle this summer:
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Jack Wilshere 5/1
Ben Gibson 6/1
Andros Townsend 7/1
Ryan Shawcross 9/1
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Jamie Vardy 10/1
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