Gordon Taylor, chief executive of the Professional Footballers' Association, has warned that the actions of players such as Carlos Tevez could force fans to turn their back on the game.
Taylor also fears clubs will hit back at players who do not honour their contracts by taking them to court.
The Manchester City striker, the best paid player at Eastlands, ison £12 million a year but wants to leave the club 18 months into hiscontract.
Taylor said: 'When supporters are unsure who is going to be in theteam from one week to the next, never mind one season to the next, thatstarts to make people feel uncomfortable.
'You get players not honouring contracts. players who have justsigned one contract and, with their agents, are looking for the nextdeal.
'Speaking to individuals at the club they worry about how far theyare going to be pushed and whether players and the people advising themwill go a step too far.
'We are going to see things move to the law courts, too, if players aren't honouring their contracts. Clubs will start fighting back. It began with Adrian Mutu [of Chelsea] who took drugs and had to pay for breaking his contract. I think there will be more actions like this.
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'If you are well looked after and you don't respect that then to some extent you deserve a response like this.
'I was really worried that the Wayne Rooney situation at Manchester United was going off track and was glad it was sorted in the end. As a public relations exercise it stretched the imagination and it's almost a replica now with Tevez.
'This is no way to run sport, no way to run a business. If we disillusion spectators we are abusing the very special position we're in.'
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Taylor also claimed that sacking Sam Allardyce as manager of Blackburn Rovers, his former club, is 'a recipe for disaster.'
He said: 'It looks a little naive to discount the experience of a manager who has done so well with limited resources and then to put the youth team manager in charge, saying they don't expect to appoint someone for two or three months from a list provided by the company advising them. It's a bit of a recipe for disaster, I must say.
'At the moment there are influences in the game that make you wonder about its long-term interest.'
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