The star is currently touring the UK with his 15 Years of Hits live show, and was set to perform at the Scottish city’s OVO Hydro arena.
He later posted a video on Instagram Stories, explaining he was feeling “run down” and was having trouble with his voice.
"Most of the time as singers, you can kind of get through it if your voice is not 100%, but I walked out tonight thinking my voice is great.
The Troublemaker singer continued: “It just sounded rubbish, and it's unfair for you guys that spent all that money to come and see me. You deserve the best show, and me being at my best, and I'm so sorry from the bottom of heart, but hopefully I can recover from this.”
The star noted that he will keep fans updated on whether or not they will go ahead, following doctor’s instructions.
He ended the video with: “Apologies from the bottom of my heart, but yeah. Gutted.”
This includes Manchester AO Arena tonight, Birmingham BP Pulse on Saturday, a sold out show at London’s O2 Arena on Sunday, and Brighton Centre on Tuesday.
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