 Sinckler akamiririra England pamatanho ari pasi pemakore gumi nematanhatu, pasi pemakore gumi nemasere, pasi pemakore gumi nemapfumbamwe uye pasi pemakumi maviri, uye anga ari nhengo yakakosha yechikwata chevakuru kubvira 2016, maakakunda Six Nations Championship, Calcutta Cup neMillennium Trophy. Kuita kwaSinckler kuEngland kwakaita kuti apinde muchikwata chaWarren Gatland parwendo rweBritish neIrish Lions kuenda kuNew Zealand muna 2017. Muna 2019, aive nhengo yechikwata cheEngland chakapedza semumhanyi kuSouth Africa kuRugby World Cup kuJapan, kunyangwe akakuvara panguva yekupedzisira. 