Model Britney De Villiers said she was grabbed by a man who shouted "I've got Gibbs-White's missus" as she left Leicester's King Power Stadium following Wolves' 1-0 defeat.
She posted about the incident on Twitter and said it was "never okay to do that to anyone".
She was inundated with messages of support from people who were shocked to hear what had happened.
Ms De Villiers said: "Can’t believe a man actually thought it was okay to manhandle me after the game while I was walking to my car and shouted over to his friends 'I’ve got Gibbs-White’s missus'.
"Whether it was a joke or not it’s never okay to do that to anyone."
Midfielder Gibbs-White, from Stafford, came on as a late substitute as Wolves slipped to defeat in the first game of the new Premier League season.
It was the first time capacity crowds had returned for a Wolves game since the start of the pandemic.
Gibbs-White, 21, and Ms De Villiers have been together since last year.