The duo were missing on Tuesday as the Bluebirds dropped two points at home to Barnsley but boss Malky Mackay is hopeful they will be passed fit.
Striker Campbell suffered a shin injury during the Easter Monday win over Blackburn while defender Connolly suffered a groin strain last weekend against Watford.
Centre-half Leon Barnett has extended his loan deal from Norwich until the end of the season.
Cardiff are six points clear at the top of the table and need seven points from their final five games to make sure of promotion to the Premier League.
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- Malky Mackay