The Frenchman scored the opening goal, a stooping header, to send Chelsea on their way to a resounding 4-1 win in Baku.
Having swapped the Emirates for Stamford Bridge in January 2018 after nearly six years in North London, Giroud gave no indication of split loyalty.
Olivier Giroud celebrates after Eden Hazard scored Chelsea’s fourth against Arsenal
His celebrations were muted scoring against his former employers, and he said afterwards: ‘I left so many friends in Arsenal, this club changed my life, gave me the opportunity to live my dream come true in playing in the Premier League.
‘I owe them a lot, I will never forget, so that’s why I didn’t want to celebrate but on another side I am so proud to win this with Chelsea. I am definitely a true blue.’
He added: ‘I am very proud because this team deserved to win something.
‘We lost the League Cup against Manchester City but this one is special, the second best European cup. It was very special for me and I am very happy for the team.’
Giroud’s goal also ensured he finished as the top scorer in the competition.
Giroud got Chelsea on their way with a stooping header planted past Petr Cech