Dyer asked residents to only display flags, banners or bunting on their own properties.
He said: “What people cannot do is fly flags on lampposts or railings or any public property.
“Please do not attach anything to lampposts – it causes health and safety issues.”
The council said it would prioritise the removal of flags in “sensitive locations” and would review the strategy for removing flags on council-owned property.
Residents have also been asked to report any flags or decorations hung on public property.
“By celebrating responsibly and being mindful of others, we can ensure that Bristol remains welcoming, respectful and safe for everyone during the tournament,” Dyer added.
South Gloucestershire Council said it welcomed the celebration of events and sports teams, but reminded residents that flags should only be displayed “safely, lawfully and with consideration for others”.
A spokesperson for the authority said: “Any flags or items displayed without permission on public land or council property will be removed by the council.”
They added the rules were in place to “protect public safety, prevent damage to public assets, ensure the highway remains safe and usable for everyone, and maintain a welcoming and cohesive community feel.”
