Michael Buble's pal David Foster is 'certain' he 'will not sing again until his child is well'

David Foster tells ET Canada that his friend, Michael Buble, is "in a huge bubble" after his 3-year-old son, Noah, was diagnosed with cancer.

"Everything shuts down around you," Foster says. "You go inside your little bubble."

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The music producer, who has been a mentor to Buble over the years, doesn't think the 41-year-old singer is checking social media during this trying time but is "sure he feels the love of millions of people."

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Feliz día de la madre !! Happy Mother's Day @luisanalopilato !! #myhero #bestmommy #bestfriend
This is how the new tour begins. Off to rehearsals. We're coming to a city near you !!! #getready #2017 #mbtour
Celebrating this birthday with my favorite people !! Memories are made of this. #family #41 #starwars
Out for a walk in Melbourne with my buddy... #chicmagnet #mbworldtour #australia #showday #tourfamily
The boys are chilling and feeding the ducks today. #daffy #donald #howard #AFLAC #leavenoduckbehind #quack
I woke up to this when I walked outside this morning. Thanks Luisana Lopilato You make me feel very loved #happyfathersday #cookies #luckyman
Today is my favourite day of every year. It reminds me of the best decision I ever made in my life. Happy anniversary mi amor. #number4 #manymore #greatlifechoices #love #lottery @lulopilatophotos
The boys chillin by the pool while mom is on set working #mrmom #happyplace #family
CANADÁ Y ARGENTINA UNIDOS !!!! #vamos #eh #proud #orgulloso #minimessi
Back to work !!! Early morning phone interviews for Dubai and South Africa. I'll try not to put my foot in my mouth... #work #family #balance #sellmortimersell #MBworldtour
In my happy place with my favourite human ever. #cruisinwithmyboy #paradise #vacation #family
Oh boy did we party hard last night !! Like father like son hahha !!! thanks @lulopilatophotos for the pic #jetlag
Happy international jazz day !!! To celebrate I've decided to play flight of the bumblebee on a babies foot. #jazz #improvising #music #internationaljazzday
I love this girl from Singapore to the moon and back. That's a really long way you know #mykidsmom #milf #luckydude @lulopilatophotos
Took my godson Logan to the Giants game ! What a great kid !! #boysnightout #unclemike #meandmyshadow #latergram #vancouver #giants #hockey #whl
Happy Canada Day, Eh! #mbworldtour #Ottawa @lulopilatophotos #Noah
On the plane and off to Shanghai ! Why do I feel like this might be a long flight ? #mrmom #jettlagged #helplu #MBworldtour
Good morning from beautiful Vancouver ! #home #meandmyshadow

"He's in good shape, he's got good doctors around him and we will hope and pray for a great outcome, which I believe they will have," Foster adds. "You get in a bubble and nothing else matters."

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Earlier this month, Buble and his wife, Luisana Lopilato, shared the sad news about their son on Facebook and told fans that they would be putting their "careers on hold" until Noah was better. "I don't think he'll sing again until his child is well," Foster said. "I am certain of it."

"He's done a lot of good for a lot of people," he says of his friend. "And I think this is going to have a great, fantastic ending to it and be a new beginning."

ET recently spoke exclusively with Buble -- who just released his seventh studio album, Nobody But Me -- about the love he has for his sons, and how fatherhood changed him. "I didn't know that level of love existed, but it makes me better at everything," he said of Noah and his 9-month-old son, Elias. "It allows me to pull more emotion and be more honest and to be in the moment."

WATCH: Michael Buble Says He Would Have 'Nothing But Love' For His Children If They Were Gay

Buble also opened up about the fears that come with being a parent. "You're scared all the time because you love them so much that you can't ever, ever think of a world without them," he admitted. "You try not to even think about it."

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