Kaka joined Real Madrid from AC Milan in a £59million deal last summer.
“There are similarities with Kaka and Stevie but Stevie makes more of a contribution all over the pitch,” said the 23-year-old.
“Stevie is more complete in that sense because he can attack but also defend just as well. This is probably because Stevie has experience playing in a number of positions earlier in his career.”
Lucas added in LFC Weekly: “Even now, he is so good, he could probably play anywhere.”