Anthony Ralston is priced at 1.5 with both Betfair and Paddy Power to commit at least one foul, which implies a probability of around 67%. This is a healthy price compared to SkyBet and William Hill, where he is only available at 1.33 on the same market.

Celtic defender Ralston has started four competitive matches for Scotland in the last two years and has given up a foul in three of these. He has committed at least two fouls in each of his last two outings.

Regarded as the weak link in the Scotland defence, he is a player who is targeted by opponents and on Sunday is set to face Rafael Leao, a player who has won free kicks in eight of the last 11 competitive internationals that he has played.

Ralston will not be aided by a lack of football so far this season. Has played only 54 competitive minutes for Celtic and is set to be thrown in against a tough opponent having just come through a difficult 90 against Poland last Thursday. Mental and physical fatigue could contribute to errors and, therefore, an increased foul count.