Chelsea were stunned by the visitors who snatched all three points courtesy Anthony Elanga‘s well-placed finish this afternoon.
But unsavoury chants saw two Forest supporters arrested at Stamford Bridge this afternoon.
They were ejected from the Chelsea ground before being taken away by officers from Nottinghamshire Police, according to MailOnline.
The FA introduced new regulations earlier this year enabling them to charge clubs whose fans use the offensive term “rent boy”.
It comes as the CPS decided to classify use of the phrase – which is a breach of FA rule E21 – as a hate crime.
The Crown Prosecution Service have previously said that those who use the words are liable to face prosecution.
Chelsea fans are also understood to have complained to security staff about other incidents.
FA charges do not automatically follow in such cases, which can be left to the clubs involved and police to resolve.
However, the previous use of the term by Forest fans at a match against Chelsea on New Year’s Day may count against them.
Chants were aimed at Chelsea players at multiple grounds last season – both in the Premier League and FA Cup.