UEFA has opened disciplinary proceedings against both the Spanish football federation and the Russian football union for the "improper conduct" of their supporters during Euro 2012 group matches.
European football's governing body has confirmed that both cases relate to racist behaviour and racist chanting.
Spain's opening group game against Italy and Russia's first match against the Czech Republic are the two fixtures that are under investigation.
A UEFA statement read: "UEFA has opened disciplinary proceedings against the Royal Spanish Football Federation (RFEF) for the improper conduct of their supporters (racist behaviour, racist chanting) at the EURO 2012 Group C match against Italy in Gdansk on Sunday 10 June.
"Disciplinary proceedings have also been opened against the Russian Football Union (RFS) for the improper conduct of their supporters (racist behaviour, racist chanting) at the EURO 2012 Group A match against the Czech Republic in Wroclaw on Friday 8 June."
The cases will be dealt with on Thursday.
Spain face Portugal on Wednesday night in the first of the two Euro 2012 semi-finals, while Russia were knocked out at the group stage after finishing third in Group A.