Youth levels Sinckler was named in the
England under-20 Elite Player Squad ahead of the
2011–12 season. In his first season, he played ten times, across both the
Six Nations Championship and
2012 IRB Junior World Championships. At the Junior World Championship in South Africa, Sinckler scored in pool stage victories against
Italy and
Ireland. He was reinstated into the squad for the
2012–13 season, playing in just three matches in the
2013 Junior Six Nations, due to his commitments with
Harlequins.
England senior team His form for
Harlequins across the
2012–13 and
2013–14 seasons landed Sinckler a place in the
England national side for the uncapped annual fixture against the
Barbarians. He was named in the starting line-up for the "England XV", in a 39–29 defeat. After his performance against the Barbarians, Sinckler was picked over
Will Collier to go on tour with the rest of the England squad. Sinckler was called up to the senior
England squad again by new head coach
Eddie Jones, on 8 May 2016, for a three-day training squad. He made his debut for the Senior team on 12 November 2016, coming on for
Dan Cole during the remaining 10 minutes against
South Africa. Sinckler was a member of the side that retained their title during the
2017 Six Nations Championship, missing out on a grand slam with defeat in the last game of the tournament away to
Ireland. During the
2019 Six Nations Championship, Sinckler was referred to by
Wales head coach
Warren Gatland as an "emotional timebomb", because of some incidents that had occurred during his stint in the
2017 tour to New Zealand with the
British & Irish Lions. In the match against Wales that followed, Sinckler gave away several penalties that proved critical to the match result, and was taken off in the 57th minute. Despite his drop in form, Sinckler was later selected in England's squad for the
2019 Rugby World Cup. He was named in the starting line-up in all but one match, and scored his maiden test try in their quarter-final victory over
Australia. The team's excellent form during their campaign saw them qualify for the
final against South Africa; in the third minute, Sinckler made accidental contact with teammate
Maro Itoje's elbow while attempting to tackle
Makazole Mapimpi and was knocked out. After being helped on the field by the medical staff, he was helped off and ruled out for the rest of the match, in which they were defeated 32–12. Sinckler was a member of the team that won the
2020 Six Nations Championship and later that year started for the side that defeated
France in the final of the
Autumn Nations Cup. He scored his second try at international level against
Italy during the
2022 Six Nations and the next round against Wales saw him make his fiftieth appearance for England.
British & Irish Lions On 19 April 2017, Sinckler was included in the list of players selected for the
British & Irish Lions tour to New Zealand in June and July. On 6 May 2021, Sinckler was left out of the squad to tour South Africa. On 6 June 2021, Sinckler was called up to the
British & Irish Lions as a replacement for
Andrew Porter due to injuries. == Personal life ==