Russia and Qatar could lose the right to host the 2018 and 2022 World Cups if evidence is found of corruption in the bidding process, a FIFA official was quoted as saying.

The comments by the head of FIFA's auditing and compliance committee came as bribery claims mounted against disgraced former FIFA vice-president Jack Warner, the man at the heart of the scandal engulfing soccer's world body.

"If evidence exists that Qatar and Russia received the (World Cup) awards only thanks to bribes, then the awards could be annulled," Domenico Scala told the Swiss newspaper Sonntagszeitung on Sunday.