of play in Baku, the centre-back was left unmarked inside the opposing penalty area, deflecting the ball home after an initial header fell into his path. Papastathopoulos was named to the UEFA Europa League Team of the Week. On 15 October 2018, Papastathopoulos was forced off during Greece's 2–0 defeat to Finland and was believed to have sprained his ankle. Papastathopoulos was at the heart of Unai Emery's defense since the Spaniard took over the reins in the summer and a fixture in a winning run of nine matches. On 21 February 2019, he netted his second goal as an Arsenal player, taking advantage of a missed punch from BATE Borisov's goalie Denis Scherbitskiy to head the ball into an empty net following a corner kick from Granit Xhaka, to seal a 3–0 home win for Arsenal and send them through to the Round of 32 in the 2018–19 UEFA Europa League. On 12 April 2019, Papastathopoulos was named to the UEFA Europa League's 'Team of the week' after playing a vital role in Arsenal's 2–0 win over Napoli in the first leg of the quarter-finals. He was one of four Arsenal players selected along with Petr Čech, Ainsley Maitland-Niles, and Aaron Ramsey. On 24 April 2019, Papastathopoulos scored his maiden goal in the English Premier League via a close-range header from a corner kick, but Arsenal slipped to a 1–3 defeat against Wolverhampton Wanderers. On 29 May 2019, he started in the 2019 UEFA Europa League Final against Chelsea which Arsenal lost 4–1. This was the first time Arsenal had conceded four goals in a European match since a 5–1 loss to Bayern Munich in March 2017. On 27 October 2019, Papastathopoulos – marking his 50th appearance – scored his first goal of the season, after Crystal Palace failed to clear Nicolas Pépé's corner in a 2–2 draw at home. On 1 January 2020, he scored a close-range finish to seal a 2–0 win over Manchester United, securing Mikel Arteta his first victory in charge of the Gunners. He was named Sky Sports Man of the match. On 2 March 2020, he scored with a volley to give Arsenal the lead in a 2–0 away win against Portsmouth, helping Arsenal to be the first team in the FA Cup quarter-finals. On 1 August 2020, Papastathopoulos played as a late substitute in the 2020 FA Cup Final against Chelsea, as