Confidence behind Now Or Never Trainer Michael O'Callaghan believes Now Or Never has a "massive chance" in the Tattersalls Irish 1,000 Guineas at the Curragh on Sunday. Following a pleasing reappearance in a 1,000 Guineas Trial at Leopardstown in early April, the daughter of Bushranger returned to Foxrock earlier this month and won as she liked. Despite being snapped by Qatar Racing following her Leopardstown romp, O'Callaghan's stable jockey Kieren Fallon will be on board once more. "Kieren loves the filly and believes a lot in her, so it's great he keeps the ride," the Curragh trainer told At The Races. "I'd have no doubt she'll get the straight mile at the Curragh. "She's second favourite and we think she's a massive chance." Now Or Never is a general 7-2 chance behind Aidan O'Brien's even-money favourite Ballydoyle, runner-up to stablemate Minding in the 1000 Guineas at Newmarket .