His hesitation in clearing cost the Crusaders an early try in round one against the Blues when his kick was charged down, but Dagg said that lack of confidence was no longer an issue.
"I wasn't confident about it [before the Blues]. I didn't really want to risk it, but I have been confident in the last couple of weeks. I've been practising kicking and I'm back to normal now," he said.
"I'm hoping to play at fullback but I just have to play where I'm selected."
If Dagg does get the nod at the back ahead of Marshall, who looked rattled against the Highlanders - particularly after being dumped by Hosea Gear - he will be in a perfect position to assess a defence which was poor in Dunedin.
The normally dependable Crusaders' line was breached time and again by Jamie Joseph's men who put on a stirring display.
"It was more of an attitude thing and we'll be working on that this week. We had a bad day and you can't afford that in this competition," said Dagg.