Gary Neville says that Boris Johnson's anti-migrant rhetoric is "fuelling" the type of scene which marred Saturday evening's Manchester derby at Etihad Stadium.
During the second half, a supporter appeared to make monkey gestures towards Manchester United midfielder Fred. In a statement released shortly after the game, Manchester City said the club is "aware of a video circulating on social media which appears to show a supporter making racial gestures".
On Sky Sports, Gary Neville backed Jamie Redknapp's suggestion that racism is not just a football issue but a societal one.
"You are watching the Prime Minister’s debate last night where he is talking about migration to this country, and people having to have a certain level," said Neville.
"It fuels it all the time. Essentially, it has got worse over the last few years in this country and not just in football."
The statement from Manchester City added that they and police are investigating the incident.
"Officials from the Club are working with Greater Manchester Police in order to help them identify any individuals concerned and assist with their enquiries.
"The Club are also working with GMP regarding an instance of objects being thrown onto the field of play.
"The Club operates a zero tolerance policy regarding discrimination of any kind, and anyone found guilty of racial abuse will be banned from the club for life."