FIFA accused unnamed individuals of participating in a “concerted and ongoing effort” to undermine both the organisation and its president.
Several Premier League clubs could be without key players when the first round of fixtures gets underway.
The decisions, announced by the UEFA Appeals Body, relate to incidents during qualifying matches played on July 29 and 30.
FIFA Secretary General Mattias Grafström and FIFA Management Board members have expressed their full backing for President Gianni Infantino.
UEFA has welcomed FIFA's decision to abandon plans to sell a stake in its competitions.
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