Jamiroquai have been forced to cancel two London concerts as Jay Kay continues to recover from back problems.
The singer, 47, and his band were due to perform at the O2 Arena on 23 and 24 June, but have postponed the gigs until December.
Kay underwent painful surgical procedures on his back in May and his recovery process has been more difficult than he initially believed.
The latest cancellations come after Jamiroquai previously pulled out of dates in Japan, South Korea and Greece in recent weeks.
He wrote on his Facebook page on Thursday: "Hi J here, It is with great regret that again I have to disappoint people due to the ongoing problem with my back. I have never felt so frustrated with a situation as I feel now, and I am desperate to get back to form.
"After two operations I am only marginally more active, and I know I could never give the 125% energy I need to give to you good people a super show. I am a proud man, and it breaks my heart to have to keep moving these performances and asking for people's patience. I am distraught at this and am feeling very low.
"2017 is turning out to be a tough year, with the loss of several close friends in quick succession and the inability to perform properly in the way I've been doing, and the only way I know how to, since I did my first gig at 17 years old.
"I want to thank all of you for the messages of support you have sent me. I can't quite believe how kind you all are. A thousand thanks.
"I want to apologise to all of you who have no doubt made travel plans and taken time out to see us in Paris, Athens and London O2, but I give you my word – I promise you I will come back and give you the shows you deserve. Faster, harder and stronger.
"Thank you all so much once again for your unerring love and patience, your posts have really picked me up. From a very wounded Buffalo."