Justin Bieber praying for Lamar

The 35-year-old basketball star recently regained consciousness after collapsing at a brothel in Nevada earlier this week and Justin is the latest star to take to social media to reach out to Lamar. 

Justin posted a picture of Lamar in his LA Lakers uniform on Instagram and wrote: "We all believe in you!! Praying for you Lamar."

Meanwhile, Lamar is believed to be making progress with an insider telling PEOPLE: "Lamar has had moments when he is awake and more responsive. He is still in the ICU, is receiving oxygen and sleeps a lot. He is not talking, but seems to understand when Khloe [Kardashian] and the medical staff speak to him. He will have another head MRI in the next few days to check for any damage that could have been caused by the strokes."

However, while Lamar is making progress, "he's not out of the woods yet".

The source said: "He still has a lot of problems with his internal organs. His kidneys are a big worry. He has done a lot of damage to his body. 

"He will probably never be back to where he was before. Damage has been done." 

Lamar's estranged wife Khloe, 31, has been with him since he was admitted to hospital and has barely left his side. 

The insider explained: "Khloe still hasn't left his side and looks very tired. As soon as Lamar wakes up, she rushes over to hold his hand. She sleeps on a pullout bed next to Lamar." 

A 911 call made from the brothel confirmed Lamar took cocaine last Saturday (10.10.15) and owner Dennis Hof revealed he was taking herbal Viagra and drinking cognac. 

The combination of herbal Viagra and cocaine can be deadly.