Reports of irregular betting patterns have led to the Football Association looking into a yellow card received by a player in a match.
There are no details over who the player is.
According to The Athletic, the FA was contacted by bookmakers after they spotted unusual betting patterns.
The FA is aware of the matter and is looking into it.
The matter is not being investigated by the FA.
Spot-betting allows people to place bets on specific details of a match rather than the outcome of the game.
Lincoln defender Bradley Wood was banned from playing for six years in April of last year after being booked twice in the FA Cup.
Wood received a five-year ban for match-fixing and a further 12-month suspension after admitting to 22 charges of betting on the outcome of matches and one charge of passing on information.