Collingwood president Eddie McGuire has lashed out at the AFL and Greater Western Sydney, claiming the Giants had "cheated on their first signing" by luring Adelaide youngster Phil Davis to the club.

One day after the 20-year-old confirmed to the Crows his decision to join the AFL expansion club, McGuire said AFL football operations manager Adrian Anderson was obligated to investigate GWS for a breach of the rules.

In a bizarre day of denials and confirmations yesterday, Davis held a media conference where he said money wasn't the sole reason for walking out on Adelaide to join the Giants.