Both clubs told BBC Sport they would not comment officially yet.
In a post-match interview, Celtic manager Martin O’Neill said: “You’re asking me a lot of political questions in this moment when I’m in a euphoric state.
“The fans have spilled over, big scenes at the end, all over the place. I’m not diminishing it at all, I will have a think about it and speak to you in due course.”
Meanwhile Rangers head coach Danny Rohl told Premier Sports: “I’m not sure what was at the end, I was in the tunnel.”