The section Sebastian mentioned:
A team's tactical roles determine how well it can execute a particular tactic, but they may also provide effective counters to an opponent's tactic. While on the Strategy screen (both pregame and while play is underway), players whose roles are particularly good at disrupting an opponent's tactics are marked as either major (red bar) for the most effective counters, or minor (yellow bar) for the next-most-effective ones.
Changing player roles to add more counters will reduce the opponent's tactical effectiveness, potentially winning back the tactical advantage. Be careful, however, not to sacrifice too much of your player's fit for their roles - if you gain a bunch of red bars at the loss of many "dots" of role fit scores, that may not be a good tradeoff.
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