The three got their pre-season preparations under way having joined the Reds’ USA tour this weekend after being involved at the World Cup.Gravenberch, Isak and Wirtz were straight to work during a session that included recovery for those players involved in the 4-2 win versus Sunderland in Nashville the previous day.Take a look below.<ul><li class="ck-list-marker-bold" data-list-item-id="e39f48d4869b4f1d18cb5fa502309d123">Watch all of Liverpool's pre-season matches live on All Red Video this summer - <a href="https://video.liverpoolfc.com/pre-season/?lfm_medium=site-link&lfm_source=liverpoolfc.com&lfm_content=news-story&lfm_campaign=alr-pre-season-2627&lfm_proposition=allred" target="_blank">join here</a></li></ul>

Watch footage from Liverpool’s Sunday training in Chicago as Ryan Gravenberch, Alexander Isak and Florian Wirtz linked up.

Watch: Gravenberch, Isak and Wirtz get to work in Liverpool's Sunday session

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