• Aubameyang's winner against Benfica in the round of 32 second leg was Arsenal's 100th goal in the UEFA Europa League, group stage to final, making them the tenth club to reach that landmark – although arch rivals Tottenham beat them to it by a day.
• Sokratis Papastathopoulos joined Olympiacos in January after being released from his Arsenal contract. Having joined the Gunners in 2018 he made 69 appearances in all competitions, including the 2019 UEFA Europa League final, and scored six goals.
• Papastathopoulos and Aubameyang were also team-mates at Borussia Dortmund from 2013 to 2018.
• Emile Smith Rowe (Arsenal) and Bruma (Olympiacos) spent the second half of 2018/19 together at RB Leipzig.
• José Holebas had five seasons in the English Premier League with Watford before returning for a second spell with Olympiacos at the end of last season.
• Olympiacos midfielder Yann M'Vila spent 2015/16 on loan at Premier League side Sunderland, while Andreas Bouchalakis is a former Nottingham Forest player, having spent 2017/18 with the club in the English Championship.
• Arsenal striker Lacazette and Olympiacos midfielder Mathieu Valbuena are former Lyon (2015–17) and France (2013–15) team-mates.
• José Sá and Rúben Semedo (Olympiacos) are Portugal team-mates of Arsenal's Cédric, while Hassan and Elneny are fellow Egyptian internationals.
• Olympiacos are one of five clubs appearing in the UEFA Europa League round of 16 for the second successive season, along with Manchester United, Rangers, Roma and Shakhtar Donetsk.
• Olympiacos concluded the first phase of the Greek Super League at the weekend with a 16-point lead at the top of the table, having won 21 and drawn four of their 26 matches, while Arsenal are tenth in the Premier League despite coming from behind to beat local rivals Tottenham 2-1 at home on Sunday.
Team News
Arsenal: Saka out
Could see more changes but I think Arteta will start strong to kill off the tie completely and then sub guys off later