Answer
The prominent figure behind Lautaro Martínez's arrival at Inter Milan is Luciano Spalletti, who managed the club during the 2018–19 season. Spalletti played a pivotal role in recognizing Lautaro's immense potential, convincing Inter's hierarchy to invest in the young Argentine forward. His decision proved to be astute as Lautaro's prolific goal-scoring and exceptional link-up play quickly established him as a crucial player for Inter.