The No.23 reconvened with his Reds teammates in Tirol after a break that followed his participation at Euro 2020 with Switzerland.
He will begin preparations for the 2021-22 campaign on Thursday.
- Watch Liverpool's pre-season games live and exclusive on LFCTV GO - plus match highlights, training access, interviews and the latest news. Subscribe at www.liverpoolfc.com/watch and use code 2122GOFREE to get your first month free. T&Cs apply.