The World Cup winner moved from Benfica for ÂŁ106.8million on deadline day.
The transfer eclipses Jack Grealishâs ÂŁ100m move to Manchester City in 2021.
Chelseaâs staggering spending spree continued when they broke the British transfer record to sign Enzo FernĂĄndez for âŹ121m (ÂŁ106.8m)