Team line-ups for AFL Round 21 are being released ahead of an MCG matchup described as a major blockbuster. Multiple outlets report that both Collingwood and Geelong must make changes after losing important players. The reporting focuses on the impact of these absences on each club’s selection for the round, with updates arriving as the teams “land” for the match period. While the articles reference expert tips alongside the confirmed teams, they consistently emphasize that player unavailability is the central development driving alterations to the squads. Beyond noting that both clubs are affected, the sources align on the overall theme: Round 21 selections for Collingwood and Geelong include adjustments because crucial stars are not available. The combined coverage does not dispute the basic premise that key players are missing for both sides, nor does it highlight contrasting causes or outcomes. Overall, the information points to modified match-day line-ups and potential tactical shifts for both clubs as Round 21 approaches.