George Michael has revealed that Adele was too upset to sing a tribute to her late friend Amy Winehouse.
He said that he was eager to honour Winehouse during a fundraiser concert last November and approached Adele to perform a duet.
"We communicated by email and initially what I wanted was for us to sing Love Is A Losing Game by Amy Winehouse at the Elizabeth Taylor tribute I did at Covent Garden," Michael told London's Heart 106.2.
"She was basically telling me she couldn't. She tried to put one of [Winehouse's] songs in her own set and she couldn't even get through it. I think they knew each other from the Brit School.
"They're obviously musical goddesses but I think the tragedy would have been too much for her.
Michael insisted that he is still hoping to record a track with Adele in the future.
"I would love to do a track with her," he added. "I think she has no plans other than to have a baby right now and I think she wants to lay low for a while and gather herself and to then come back to us relatively soon with some more music and I'd love to be involved when that happens. She's lovely."
Michael recently confirmed that he will perform two songs at the London 2012 Olympics closing ceremony in August.
His new single White Light will be released in the UK on August 12.