Arriving in 2004 for £7m from Rennes, Petr Cech felt like a luxury signing in goal with Carlo Cudicini already performing well.
Furthermore, while the fee may seem low today, it was the most the club had ever paid for a goalkeeper as his signing kick-started the Abramovich era.
Cech quickly proved himself worth every penny as he won 12 major honours, including the Champions League, in his 11-year spell at the club.
He was a giant in the 2012 final against Bayern Munich, saving Arjen Robben's penalty in extra time before then stopping two more spot-kicks in the shootout.
His influence at Chelsea continues today, where he has taken on the role of technical and performance advisor.
He acts as a link between the football operation and club, and he was especially involved in the signing of Edouard Mendy, who has replicated Cech's success since he joined in 2020.