Chelsea have released a statement confirming Gallagher's departure accompanied by a video montage of his best moments at the club. The statement reads: "Conor Gallagher has completed a permanent transfer to Atletico Madrid. We wish Conor the very best as he begins a new chapter in his career."
Gallagher has also said a final goodbye to Chelsea fans in a post on social media. "To everyone at Chelsea, thank you for making my dreams come true," he said. "It's been an absolute honour every time I put on the shirt, and it was a dream come true to captain the team on many occasions. I loved every moment. These memories will last forever. I appreciate all the love and support from the fans. Hearing the chant of my name at the Bridge is a special feeling, and the banner you displayed [against Spurs] meant the world to me. Thank you for everything. I wish the club all the best for the future, and I hope to see you all soon at Stamford Bridge."