Lamar Odom's health continues to improve, but a source tells PEOPLE there's a long way to go yet.

By Steve Helling
Updated October 19, 2015 07:15 PM
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While there is no doubt Lamar Odom‘s condition has radically improved over the last few days a source tells PEOPLE the former NBA star still has a long way to go.

“Every day is a little more encouragement, it really has been a miraculous turnaround,” the source reveals. “From what I understand, he’s not talking. It’s obvious that he understands what is going on because he can nod and shake his head, and he can follow simple commands. He can squeeze the doctor’s hand. He’s still very weak, though.”

Odom, 35, woke up from a four-day coma on Friday, after he was found unconscious at a Nevada brother last week. PEOPLE confirmed on Sunday that he is no longer on a ventilator and is breathing on his own, but a source explains he’s still not out of the woods.

“[Lamar’s] kidneys have been very damaged and there is talk about him needing a transplant down the road, but that’s a long way off,” they reveal. “That’s been one of their biggest worries in the past few days, that his kidneys could fail.”

The source adds that Odom has been “responsive, but there are so many things that could go wrong right now, and the doctors have still been guarded. Khloé has been praying a lot, both to herself and out loud to Lamar. She wants him to know that she’s still on his side, and that everyone is praying for him.”

Khloé Kardashian has also been supported by her boyfriend James Harden who PEOPLE has learned has been respectfully keeping his distance.

“He is so nice and being as supportive as humanly possible given the situation,” a source close to the Kardashians recently told PEOPLE.