Gambling rules introduced in 2014 forbid players and coaches from betting on any footballing activity worldwide.
Colback could now face Football Association charges, even though it is understood that the match in which the 26-year-old allegedly broke these rules has no bearing on Newcastle's fight against relegation from the Premier League.
It is FA policy not to comment on such cases until an individual is charged.
But Press Association Sport is reporting today that the FA is looking into allegations that betting rules have been breached.
Most Popular
-
1
National Mackem Day 2022: 14 things you'll only understand if you're from Sunderland
-
2
Watch as would-be robber is jailed after botched Post Office raid in Sunderland that saw him spooked by a smoke cloud
-
3
Sea fret - a look at the foggy phenomenon which spoils sunny days in Sunderland
-
4
Charity shop volunteer wore Christmas jumper to look 'harmless' before shocking sex attack on teenage boy in toilet
-
5
Closed Hetton pub The Davy Lamp set to become restaurant under new plans
Colback has been a regular for Newcastle since joining from neighbours Sunderland in 2014, and played in the club's goalless draw at Aston Villa yesterday.
Manchester City's Martin Demichelis accepted a charge that he broke betting rules earlier this season.
The Argentina centre-back, 35, was accused of 12 breaches breaches of FA rule E8 concerning matches played between January 22 and 28 this year.