2020 which Spurs won 3–1. He was at fault for two of the goals in a 3–3 draw against LASK on 3 December. Celtic On 3 August 2021, after being told he was not part of new Spurs manager Nuno Espírito Santo's plans, Hart signed for Scottish club Celtic on a three-year contract. Hart made his debut two days after signing in a 4–2 away win against Czech side FK Jablonec in the Europa League, but appeared uncomfortable during the match, particularly during Celtic's concession of a second goal. However, manager Ange Postecoglou said that Hart's debut was "okay" and insisted that "Joe will improve". He made his Scottish Premiership debut on 8 August, keeping a clean sheet in the 6–0 thrashing of Dundee at Celtic Park. Hart made an error in the Europa League qualifying play-off match against AZ Alkmaar on 26 August 2021, failing to clear his lines and conceding as a result. He did go some way to redeeming himself later in the same game, with two impressive saves to deny Zakaria Aboukhlal from scoring either side of half-time. And although Celtic lost 2–1 on the night, they narrowly managed to win the tie on aggregate. On 19 September, Hart was named stand-in captain for a league game against Livingston. Hart received praise for his performance despite Celtic losing 1–0, making saves to deny Jack Fitzwater and Alan Forrest. Hart received plaudits for his performance against Hibernian on 27 October, denying a close-range Joe Newell effort and smothering a Jamie Murphy strike, helping Celtic to a 3–1 win. Two matches later, however, Hart was at fault again for a goal in a 4–2 win at Dundee. On 19 December 2021, Hart played the full 90 minutes as Celtic won the 2021–22 Scottish League Cup after defeating Hibernian 2–1 via a brace from Kyogo Furuhashi in the final. In May 2022, Hart won the 2021–22 Scottish Premiership with Celtic. In October 2022, Hart made an error against RB Leipzig in an away Champions League group stage fixture. The error lead to Leipzig's third goal in a 3–1 defeat. International career Youth levels Hart made his first international appearance in September 2005 in an England under-19 friendly match against Belgium at Darlington; replacing starting goalkeeper Ben Alnwick at half-time, he was unable to save the penalty that made the score 3–2, but with three minutes left made a "terrific