October 16, 2015 04:30 PM

Lamar Odom has woken up after four days in a coma.

A source close to the situation confirms to PEOPLE that “Lamar is conscious and was able to say hi to Khloé” on Friday afternoon.

“But his condition remains guarded,” the source adds.

Another source close to the family told PEOPLE on Friday that Odom had opened his eyes and that “there has been some improvement” in the days since Odom, 35, lapsed into a coma after being found unconscious at a Nevada brothel on Tuesday.

Sources previously told PEOPLE on Thursday that the former NBA player was breathing with the help of a ventilator at Sunrise Hospital in Las Vegas.

Odom had cocaine and opiates in his system when he was admitted for emergency treatment on Tuesday, a source also confirmed to PEOPLE.

Odom’s estranged wife Khloé Kardashian and the rest of her family – with the exception of Rob Kardashianall rushed to be by Odom’s side in Las Vegas upon hearing the news.

RELATED VIDEO: Khloé Kardashian Is Forced to Make Medical Decisions for Lamar Odom

An "overwhelmed" Kardashian has been in charge of Odom’s medical care as the two are still legally married despite having split two years ago.

Kardashian is still in Las Vegas, though on Thursday Kardashian’s mother Kris Jenner, Kourtney Kardashian and sister Kim Kardashian West arrived back in Los Angeles.

Kardashian’s family members have put out messages of support on social media since Tuesday, with Kris calling him “our fighter” and Kourtney praying for his "beautiful soul."

Reporting by ELIZABETH LEONARD and AILI NAHAS

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