Pulev suffered a pectoral tear in the build-up, and despite wanting to fight on, the Bulgarian was advised to pull out of the fight on medical grounds.
Next in line Carlos Takam has since accepted an offer to step in and face Joshua in Cardiff on October 28, whilst Pulev remains the number one challenger with the IBF.
“I am aware that the news of my injury and the subsequent cancellation of the game between me and Anthony Joshua for the world title surprised you,” said Pulev.
“It wasn’t easy for me to make that decision! I know, in my place, almost everyone would choose to get into the ring in Cardiff, despite everything and collect a few million.
“Anyone else, but not me!
“In my life and in my world, it’s not all money. I’ve learned that a man goes into battle to win it. I understand that despite the vicissitudes of life, a man should not cheat on his beliefs.
“Anthony Joshua has to defend world titles against a strong rival and I’m glad he already has one.
“I’m still more thirsty for this battle, and I think it’s only a matter of time. It is such challenges that make my heart beat hard and feel that I am truly alive. In a week’s time, we tried everything to surpress the injury, but everything needs its own (healing time).
“I take it as a sign. If God decided, then that’s how it was meant to be. Still, I will be myself and I will not betray my principles. A few million won’t make me richer or happier.
“My wealth is the undying love of the Bulgarian people, from whom I always buy strength and inspiration and that gives me the meaning of everything I do!
“Thank you from the heart of all Bulgarians for your faith and support, it means a lot to me. We’re moving on!” he added.
Pulev, despite retaining his place the IBF, may now be required to meet number four-ranked Christian Hammer in 2018 before landing another chance to fight for the red belt.