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Such are the standards Jurgen Klopp demands of his Liverpool players, day one of pre-season left a lasting impression on Andy Robertson upon his arrival on Merseyside.

The Scotland defender recalled throwing up on the very first day of preparations for the 2017/18 season shortly after his arrival from Hull City, branding the vomit-inducing lactate test a "terrible" experience. Given the vast success the Reds have enjoyed since then, Klopp and his coaching team have not let standards slip, meaning the squad are set for more gruelling experiences over the next few days.

Some players are still enjoying an extended break before joining up with their teammates but there were still plenty of familiar faces at Liverpool's AXA headquarters on Monday. Here are five things we spotted from day one of Liverpool pre-season training.

James Milner has a mythical reputation when it comes to pre-season and he continues to raise the bar - quite literally - for those around him. The 36-year-old earned a short-term contract extension by making 39 appearances in all competitions last season and there is no doubt he still has plenty to offer Klopp as a squad player.

At his advanced age, Milner knows the importance of preparing properly for the upcoming season to avoid