Christian Pulisic scored 11 goals and contributed 10 assists in his debut season for Chelsea. Impressive returns, yet when Frank Lampard describes the American as a 'work in progress' you understand what he means.
His second season at Stamford Bridge has been hampered by injury frustrations but Pulisic still offers glimpses of his class when he does play and Chelsea now need him more than ever.
Efforts to kick on after that positive first season in the Premier League have been foiled by recurring hamstring injuries that have restricted Pulisic to just four Chelsea starts and eight appearances in all so far in this campaign.