Sinckler, who had been linked with a move to Gloucester next season, is returning after a star turn at the Rugby World Cup in Japan.
Sinckler has represented England at U16, U18, U19, and U20 levels before making his test debut as a replacement in England’s 37-21 win over South Africa at Twickenham on 12 Nov 2016.
After making his first nine England appearances from the bench, Sinckler made his first start against Ireland during the 2018 Six Nations.
The 120kg prop however conceded the second most penalties of any player during the 2018-19 Premiership season with 29 behind Northampton’s Alex Waller. Harlequins captain Chris Robshaw spoke to him about discipline after he received a yellow card for slapping Sale’s Faf de Klerk in the chest.
He was infamously described as an ‘emotional timebomb’ by Wales coach Warren Gatland during the 2019 Six Nations. Subsequently, Sinckler conceded three penalties during England’s 21-13 defeat by Wales and was replaced in the 57th minute.
Full Harlequins squad to face Gloucester Rugby at The Stoop (KO 15:00):
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