Neither West Ham nor Millwall have been disciplined by the Football Association following separate investigations into abusive chanting from supporters, although both clubs have been warned that future misconduct could result in sanctions.
One West Ham season ticket holder was given a lifetime ban by the club following an investigation by the Metropolitan police in the aftermath of the 3-1 defeat by Tottenham at White Hart Lane in November, when a group of away fans were heard hissing and chanting the name of Adolf Hitler.
Two Millwall fans were arrested and charged by police and given lifetime bans by the club after undercover Sky Sports News footage exposed racist abuse during matches against Birmingham City in October and Leeds United in November.
A statement read: "The FA advises that consideration will be given to taking disciplinary action against both West Ham United and Millwall if further reports of spectator misconduct are received, however, no charges are to be issued to either club in relation to these isolated incidents."
The FA waited for the conclusion of the police investigations before submitting its official reports, acknowledging the work West Ham had done to prevent such abuse occurring again, noting that the return fixture against Spurs at Upton Park in February passed without major incident.
A West Ham statement said: "The club works extremely hard to address all forms of discriminatory behaviour, wherever they occur, and operates a strict zero tolerance policy towards anyone who behaves inappropriately when following the team."
Millwall, who are the subject of a separate police investigation following the ugly scenes that marred their FA Cup semi-final with Wigan Athletic at Wembley, imposed lifetime bans for the fans arrested for making offensive/racist remarks.
The FA said it took into consideration "the work the club continues to do in partnership with its local community to educate supporters and help tackle discriminatory language/behaviour" when making its decision.