Fifa presidential candidate Prince Ali of Jordan says a co-operation agreement between the African and Asian football confederations is a "blatant attempt to engineer a bloc vote" in the election.
Prince Ali, 40, has asked the game's world governing body to investigate whether the pact breaks its rules.
The two confederations account for 100 of the 209 votes to be cast in the presidential election on 26 February.
Ali stood for the post in May but was defeated by incumbent Sepp Blatter.
Blatter, 79, was elected for a fifth term but then stood down and has since been banned for eight years.