Douglas, who beat stage 4 oral cancer in 2013, was at a Q&A in London on Sunday where he talked about filming 1996’s The Ghost and the Darkness with Kilmer, 56.
“The picture didn’t turn out as well as I hoped but I had a wonderful time. Val was a wonderful guy who is dealing with exactly what I had, and things don’t look too good for him,” he told host Jonathan Ross.
The 72-year-old actor added, “My prayers are with him. That’s why you haven’t heard too much from Val lately.”
In 2015, rumors of a health problem for Kilmer circulated when the Top Gun star was seen with what looked to be a tracheostomy tube around his neck. He also kept his neck covered with scarves and bandanas.
The actor vehemently denied any health issues through his social media in October 2015, dispelling rumors that he had a tumor after being spotted at the UCLA Medial Center.
“Thank you all for your love and support. There’s a rumor I’m unwell again and in hospital which is totally untrue. I was in to verify I have no tumor or infection of any kind which was verified by the very caring experts at UCLA,” he wrote on Facebook at the time.
Kilmer seemed to be on the mend, being spotted without a breathing aid while running errands in London early this year.