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The ECA is the body which represents all professional clubs in Uefa, and the only one Uefa recognises.
It has said 💪 it is "strongly opposed" to the new league, and held an emergency meeting on Sunday after news of its creation 💪 broke.
Representatives from the Super League clubs did not attend.
This includes Juventus chairman Andrea Agnelli, who was chairman of the ECA 💪 but has resigned from his position.
What is the ECA?