Liverpool's Brazilian midfielder Philippe Coutinho (CL), Liverpool's English midfielder Adam Lallana (CR) and teammates celebrate their third goal during the English Premier League football match between West Ham United and Liverpool at The London Stadium. Photo/AFP

Liverpool kept their top-four destiny in their own hands as Philippe Coutinho's double earned them a 4-0 Premier League victory at West Ham United on Sunday that moved them back above Manchester City into third place.