The couple released a joint statement, posted to Bublé’s Facebook page, on Friday 4 November, stating Noah is currently undergoing treatment in the US.
“We are devastated about the recent cancer diagnosis of our oldest son Noah,” the official statement read.
“Luisana and I have put our careers on hold in order to devote all our time and attention to helping Noah get well.”
Bublé continued: “We have always been very vocal about the importance of family and the love we have for our children.
“At this difficult time, we ask only for your prayers and respect for our privacy.
“We have a long journey in front of us and hope that with the support of family, friends and fans around the world, we will win this battle, God willing.”
Fans immediately shared their condolences on the singer’s Facebook page.
“I’m totally devastated for you today,” one person wrote.
“My thoughts and prayers are with you all, please God we hope that Noah pulls through this and carries on to enjoy a full and happy life.”
Rumours circulated that Bublé’s son had cancer after celebrity blogger, Perez Hilton, reported the news on his website.
“While doctors first thought he had Mumps, officials later determined it was cancer,” Hilton wrote on 3 November. “As of now, it is unclear what kind of cancer it is.”
Bublé and his wife are also parents to 10-month-old Elias, born in January 2016.