The 20-year-old Belgian has scored five goals in five league appearances since joining the Toffees on a season-long loan from Chelsea and credits the Spanish coach for bringing out the best in him.
"Roberto wants me to improve on all aspects [of my game]," Lukaku told the Daily Mail.
"He wants me to be more deadly in front of goal, cleverer with my movements, more decisive and wants my first touch to improve. Everything a striker needs to know.
"Players have good points and negative points. Some people just want to work on the negative points and forget what is good about your game. He works on everything."
Tottenham Hotspur visit Goodison Park this afternoon.