Crusaders full-back revealed that he was a bundle of nerves ahead of his comeback in Friday's 32-15 bonus-point win over the Jaguares in Christchurch.
After being sidelined for almost six months with a shoulder injury, Dagg scored two tries for the seven-time champions on his return, but the 27-year-old revealed he was so nervous before the match that he couldn't eat any solid foods.
"I was real nervous, I couldn't really eat," Dagg told Fairfax Media.
"I had some food at lunchtime but at 3.30pm I couldn't really eat, so I just had a smoothie shake.
"But I was chomping at the bit, just to get out there. It was a perfect day to play footy, I just really enjoyed it."
Dagg also revealed that his successful comeback was due to a decision to play what was in front of him and back himself if he was in space, rather than opting to take a conservative approach.
"My coach told me that nine times out of 10 they (his instincts) are going to be right, so if you are going to do something do it at 100 per cent," he added.
"I don't want to get too carried away. It was just one small step for me… A step in the right direction."