Callum Paterson
Paterson was the match-winner in the meeting between these two sides back in December and he has proved a valuable player from Neil Warnock.
He is a full-back by trade but was moved further forward by the Bluebirds’ boss to play roles in midfield and attack.
His contribution of 10 goals and six assists in all competitions last season proved to be a big factor in helping Cardiff to gain promotion to the Premier League.
Despite not being a household name, Saints will have to guard Paterson closely to limit his effectiveness.