Robin Gibb. (Luis Enrique Ascui/Reuters)

“This concern from people all over the world has demonstrated the depth of feeling and love that the Bee Gees have achieved over the years,” Gibb wrote. “It is humbling and I take your prayers and good wishes for my health very seriously.”

The 61-year-old musician was hospitalized in October for abdominal pain and colon inflammation, People reports. Gibb has appeared very thin in recent pictures and pulled out of a charity event performance in late October, adding to speculation that the singer is seriously ill. British tabloid the Sunday Mirror has reported that Gibb is suffering from liver cancer. This has not been confirmed by his camp.

Gibb’s brother Maurice died from a twisted intestine, an inherited condition, in 2003.

“I have been very unwell and am now on the road to recovery, and your prayers and wishes are a great tonic to me,” Gibb writes. “I believe because of you I will get well and my deepest love goes out to you all.”