The band were performing at Liverpool's Pier Head over the weekend when Duke collapsed before lead singer Gary Christian called for medical assistance.
The band have since shared a statement on social media, writing (via The Mirror): "Thank you so much to all the many, many messages regarding our drummer Lionel Duke, who suffered a cardiac arrest while performing at tonight's amazing concert ahead of Sting.
"We are awaiting news from the Heart and Chest hospital at Broad Green and thank the phenomenal team of medics present from On the Waterfront Liverpool's team who stepped in so swiftly to help our poor Lionel."
While on stage, Sting addressed the audience and said: "The drummer in the band before is OK. He's in hospital. All of us are praying he's going to be fine. Our thoughts are with him."
The Christians, whose name derives from the surname of the three original band members, were formed in 1985 and went on to have the highest-selling debut album of any artist at Island Records in the late '80s and early '90s.
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