Few teenagers can match the composure of Liverpool and England defender Trent Alexander-Arnold. No matter how grand the occasion has been in the 19-year-old’s nascent career, he’s responded with poise and self-assuredness. These character traits should be required, with first-choice right wing-back Kieran Trippier struggling with a groin complaint. Three Lions head coach Gareth Southgate will not worry about Alexander-Arnold. He made his first Premier League start at bitter rivals Manchester United, struck an explosive free-kick during his Champions League debut in the play-off against Hoffenheim and became Liverpool’s youngest-ever starter in the final – May’s 3-1 loss to Real Madrid.