Former Brazil midfielder, Kaka, has hailed Chelsea's Romelu Lukaku as the number one striker in the world.
Lukaku returned to Stamford Bridge from Inter Milan this summer in a £97m deal.
The 28-year-old scored 64 goals in 95 appearances for the Serie A champions during his two-year spell.
Lukaku has since scored on his second debut against Arsenal and twice against Aston Villa.
Kaka, who won the Ballon d'Or in 2007, told Gazzetta dello Sport: "Romelu is number one, he reminds me of Adriano at his best - physical strength, intelligence, speed.
"A year ago AC Milan took the lead [in the Serie A title race] after the first derby, then Inter took it back and won deservedly."