Šeško is described as a tall, athletic centre-forward known for his powerful finishing, explosive pace, and aerial ability, standing at 1.95 m (6 ft 5 in). He has also recorded a top speed of 35.7 km/h, which is just 1.5 km/h slower than the fastest player in the Bundesliga. Šeško is considered one of the most promising young strikers in Europe. His combination of physical strength and technical ability has led to comparisons with Zlatan Ibrahimović, who he cited as a role model during his formative years. Recruitment analysts have described Šeško as a clinical forward capable of dropping into space, holding off defenders, and linking effectively with teammates in advanced positions. While he initially operated primarily as a penalty-box striker, Šeško has gradually expanded his involvement in the build-up phase, becoming more engaged in general play around the final third. He has shown improvement in his link-up play and movement off the ball, often dropping deeper to support attacking transitions and contribute to team possession beyond just finishing chances.

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