With 100 days until kickoff, ESPN projects starting lineups for 2026 World Cup contenders. The defending champions Argentina aim to become the first team to win consecutive titles since Brazil in 1962, led by Lionel Messi in what will be his final tournament appearance. The analysis examines squad strengths, weaknesses, and formation strategies for major nations including Brazil, Belgium, and Canada.

Argentina's projected squad features veterans like Messi and Di María alongside emerging talents such as Valentín Barco and Nico Paz. The team's strength lies in their established core from recent Copa América victories, but defensive depth and forward competition present challenges. Brazil under Carlo Ancelotti emphasizes attacking speed and technical ability, though Neymar's fitness remains uncertain. The Seleção's midfield pivot of Bruno Guimarães and Casemiro provides stability despite the absence of injured Rodrygo.

Belgium enters with a talented roster featuring Kevin De Bruyne and Romelu Lukaku, though injury concerns and coach Rudi Garcia's inexperience at major tournaments create uncertainty. Canada boasts home-field advantage and Alphonso Davies but faces questions after their Gold Cup quarterfinal exit to Guatemala. Each contender shows vulnerabilities that could determine their tournament fate, with squad rotation and player fitness becoming critical factors as the competition approaches.