Lavia is a defensive midfielder. According to Anderlecht's head of academy Jean Kindermans, Lavia's best position is a deep-lying playmaker, as "he can deliver passes and is always calm on the ball". Lavia stated that his inspirations are Barcelona player Sergio Busquets and his former Man City teammate Fernandinho. Lavia visibly expresses himself to be comfortable when recovering the ball, making use of the intense pressing using intelligence, tenacity, along with pace, and when he makes line-breaking deep passes. He is also adept at driving forward with the ball once he regains possession, which makes him extremely effective on the counterattack. Lavia's dribbling ability enables him to break lines of defensive pressure, and he is also lauded for his awareness and reading of the game. Lavia is among the most accurate midfielders in the Premier League, with an accuracy-adjusted pass completion rate of 84% in the 2022–23 season, which had him tied for fifth best in his position. Former Southampton teammate Oriol Romeu, referring to Lavia, said that "if you’re that young and playing that well, you’re going to be special".

From English Wikipedia, CC BY-SA