"It's the best news we've had for a long time and means a lot to the team," he says.
"She's a massive part of this team and it would have been very undeserved if she wasn't able to play in the next game because she didn't do anything wrong. We're really grateful to FIFA for over-turning the decision and I think it's really good for the game that they've been able to do that."
Erceg was given her marching orders in unjust fashion in the final minutes of the 1-0 win over Colombia after attacker Tatiana Ariza went down under what appeared to be an innocuous challenge.
New Zealand went on to close out the victory without their captain after goalkeeper Erin Nayler pulled off a stunning save from the resulting free kick. But, if the sending off had been allowed to stand, they would not have been able to field Erceg for the French encounter, in which New Zealand need to secure a positive outcome to ensure their progression past the group stages.
"Relief is the key word," the 129-cap veteran says.
"I definitely felt that a bit of injustice had been dealt my way and, after putting in such an effort to get to the Olympics, it would have been a shame to miss out. It's been such a roller coaster over the last couple of days so I'm thrilled to finally know that I'll be playing."
Erceg will not allow herself long to soak up the satisfaction of the decision though as the challenge posed by France must be the focus.
"It's straight back to work - the girls know what needs to be done and we'll be well prepared going into the game," she says.
"We know that they're going to be a very competitive side so we just have to bring that winning momentum from the last game. I really do believe we can progress to the next stage."