Unlimited money
Simply raise the pay of one of the coaches to £999,999,999 per week. Then, offer him a new contract. The coach will want a contract for roughly -£14000000 a week. Now accept the contract to get that money in your account every week.

Rapidly improving players
Do not purchase any coaches, but still select players to train as you normally would if you had coaches. The players will improve the selected statistic by one point every week, and youth players will improve quicker. If players are left training on this statistic when they get to 99, they will keep improving to numbers above 100.

Free players
Simply replace the first two digits of the price with zeros when players cost more than £23,000,000.

Extra money
Just pace your best player on the transfer list for £999,999,999. He will be bought for this price in a couple of weeks.