West Ham United boss Sam Allardyce is unhappy with new financial controls being voted in by the Premier League.
Big Sam wrote in the London Evening Standard: "The system thrived on investment and my concern is that FFP appears to significantly reduce that. My other concern is, that to sustain the product, we have to continue to tempt the best players to come to these shores.
"I understand the reasons for FFP but it's about more than just finance - it's the product. If you have something valuable to sell, you get more money for it but the only way you develop a good product is to invest in it. I know we have had problems with clubs such as Portsmouth but you should not tar everyone with that particular brush.
"Every week, businesses in this country go to the wall and then start up again. That's the way of the business world.
"The value of the brand has to be managed carefully and the transition period will be vital because I do fear there will be clever people who will look for legal loopholes.
"I stress that I'm looking at this purely from a footballing point of view.
"I was in Spain earlier this week and their league is suffering because of the dominance of Barcelona and Real Madrid. Those clubs take 50 per cent of the television money, with the remainder shared between the other clubs.
"We divide ours much more evenly, with further incentives for success, which seems an eminently fairer system. Things are certainly not perfect, though, and I do understand the reasons for FFP. But the way it is implemented, starting next season, will be crucial to this great game of ours."