Fifa president Gianni Infantino has written to all 211 member associations saying they will receive $40m (£30m) if they back his controversial plan to sell off stakes in its major competitions.
Infantino has set a deadline of 19 September for football federations to accept his plans if they want to access an initial $20m (£15m).
Football's world governing body has said it wants to create a commercial subsidiary to run its main events, including the World Cup, and external investors will be able to buy stakes in it.
Uefa, European football's governing body, accused Fifa of using football "to enrich themselves and their friends".
The incentive to nations comes less than 24 hours after the bombshell statement rocked football's foundations, quickly leading to condemnation from Europe, Asia and North America.