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The audio message distributed on Monday was reportedly issued by IS official spokesman Abi al-Hassan al-Muhajer, the Mirror reported on Tuesday.
"O lions of Mosul, Raqqa, and Tal Afar, God bless those pure arms and bright faces, charge against the rejectionists and the apostates and fight them with the strength of one man," al-Muhajer was quoted as saying.
"To the brethren of faith and belief in Europe, America, Russia, Australia, and others. Your brothers in your land have done well so take them as role models and do as they have done."
Telegram Messenger has become a favoured tool of terrorists to disseminate propaganda due to its impenetrable security.