«Sunny…I love you, brother. I just can’t even fathom you not here. We’ve got so much more living to do before we are done,» Slater wrote.
«There’s been hard times but there have been so many good ones, too. Just praying you wake up and we get more of you.»
Three-time world champion Mick Fanning also posted a message of support for the Hawaiian star.
«Praying for you my brother! Was such a special surprise to hang with you just a little while ago. A hero, a shining light and such a loveable human. Love you mate,» he wrote on Instagram.
It’s not clear what led to Garcia’s hospitalisation in Portland, Oregon, however he has been open with his struggles with depression.
In March, he wrote on his Facebook page that people who don’t suffer mental health conditions «don’t understand the pain and frustration that we go through».
«I have a incredible life surrounded by people that love and care for me, and I get to travel to beautiful places to surf and meet different people from all over the world but I can tell you when I get down that none of that matters,» he wrote.
«I just feel like nothing or anyone can help me at the particular time so I just keep sharing my feelings hoping that it helps any of you out there that suffers from anything and encourage you to reach out and talk to others like yourself because this life can really be beautiful.»
Garcia made has professional surfing debut at the age of 17 in 1986 and was in the top 10 surfers globally throughout the 1990s. A six-time Hawaiian Triple Crown Champion, he claimed the ASP World Title in 2000.
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Rachel Clun is a journalist at The Sydney Morning Herald.