#3 Andrew Robertson

Liverpool signed Andrew Robertson from the relegated Hull City at the start of the 2017-18 season to end their long-term crisis at the left-back position.
The Scotsman had a slow start at the club but he has definitely lived up to his expectations and cemented his place in the starting line up ahead of Alberto Moreno. Unlike other Liverpool's left-backs, he is defensively sound as well and adds composure to the backline.
His work-rate and tendency to help the attacks perfectly compliments the Jurgen Klopp style of play. He has assisted three goals this season and has completed 1,126 passes with an average of 62.56 passes per game.
He is still in the initial months of his career at Anfield and is likely to improve with time. So it is safe to that he will stay at the club for many more years to come.