Arsene Wenger admits he can find "no rational answer" as to why the Abu Dhabi United Group wanted to launch a takeover of Manchester City.

The arrival of the Middle Eastern billionaires has changed the balance of spending power in the Premier League - which was shown by the shock capture of Robinho in a British record deal from under the noses of Chelsea on deadline day.

The Arsenal manager, though, maintains the reason behind the unexpected developments in the City boardroom remain a mystery. "I don't know why these people are in there," he said. "It doesn't look like they are there to make any money. So if they are not there to make money out of it, then are they buying it out of love? Well, I am not sure these people are supporters of Manchester City from a young age.

"So then comes a further question: Why are they doing it? Why have they bought the club? I can't really find a rational answer.

"If it is just a toy for them then it is even more dangerous. You can have 20 billionaires in the Premier League, still only one can win it and one will come last.

"The problem is that when these people who have bought into football get tired of it, what will they leave behind? That is the real question you can ask. If their investment is purely strategic, based on the market interest, then they could easily decide one day that it is not strategic to be in that market any more, and then they will leave."

Wenger, whose side currently lead the Premier League, has made a reputation for spotting talent young and developing potential into world-class ability rather than simply splashing out on big-name signings. However, he maintains despite all of the money now within the game, proper etiquette must be observed and not to have players publicly courted by rival clubs.

"My thoughts are that it is good to have money in football, but it's how you use it," he said. "Basically you still have to respect the rules. The football bodies have to be very cautious about that.

"You can't have a situation where people just come in and say they want to buy [Cristiano] Ronaldo or they want to buy [Fernando] Torres. That is disrespectful. These players are under contract.

"If a player is under contract then you cannot make public comments which destabilise the club. What you have to do is first of all ring the player's club, to ask if they are ready to sell for this price. If that doesn't happen, then you have to shut up."