Uefa says Aston Villa, Brighton and AC Milan can take part in European competitions this season after they made "significant changes" to comply with multi-club ownership rules.
Villa's owners have a stake in Vitoria Guimaraes and Brighton owner Tony Bloom is involved with Union Saint-Gilloise.
Milan and Toulouse are majority owned by RedBird Capital Partners.
Uefa made it's decision after investigating a "potential conflict with the multi-club ownership rule".
Brighton will be in the Europa League, while Union Saint-Gilloise are in the play-offs for the same competition.
Villa have qualified for the Europa Conference League, while Vitoria Guimaraes are in the second qualifying round for that competition.