John Stamos sends his love to Dave Coulier following news of his cancer diagnosis.

Coulier, 65, revealed to PEOPLE in an interview published on Wednesday, November 13, that he was diagnosed with stage 3 non-Hodgkin’s lymphoma in October after an upper respiratory infection caused large swelling in his lymph nodes.

Hours after the news became public, Stamos, 61, shared a sweet tribute to him on Instagram, filled with several photos detailing the events Full house the long-lasting friendship of the stars.

The post started with a photo of Stamos hugging Coulier and was followed by a throwback photo of the two, seemingly from their days Full housewhich ran for eight seasons from 1987 to 1995. Other photos showed the two goofy faces and posing with their late costar, Bob Saget, who died in January 2022 at the age of 65.

“My brother from day 1. I love you @dcoulier and I will be by your side,” Stamos captioned the post.

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Coulier’s wife, Melissa Bring, replied in the comments section: “I love you PP – thank you for the daily support and love!! ❤️❤️”

Fans also commented on Coulier and Stamos’ close bond after working on the beloved sitcom, with one social media user writing: “These relationships that start at work and end up becoming lifelong friendships are extremely rare… and quite beautiful. I love the brotherhood between you!!

Coulier shared with PEOPLE that Stamos would visit him on Saturday, November 16 – one day after his chemo treatment.

“He says, ‘If you just want to sleep, I’ll just sit with you, or if you want to listen to music or just talk, whatever.’ And I’m like, ‘Wow. That’s like a brother. That’s really a brother,” Coulier said.

Stamos, together with colleague Full house costars Candace Cameron Bure, Andrea Barber, Jodie Sweetin, Lori Loughlin, Scott Weinger and series creator Jeff Franklin were all part of a group message Coulier sent to share the news of his diagnosis.

The actor told PEOPLE that he wanted to make sure his castmates heard the news from him, noting that everyone’s reaction was “immediate.”

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“It was just this outpouring of, ‘I’ll be there. Just name the time, and I know you’re in good hands with Mel, but what can we do?’ It’s really overwhelming how much love we have for each other,” he said. “We’ve been there for each other for so many years and it’s pretty remarkable.”