Borussia Dortmund chief executive Hans-Joachim Watzke has hit out at Manchester City’s excessive spending, and called on UEFA to ban Roberto Mancini’s side from the Champions League.

The two teams go head to head in European competition tonight at the Etihad Stadium, and Watzke has added spice to the encounter by suggesting UEFA ought to act in order to cut down on ‘back door spending’.

City’s Abu-Dhabi based owners are believed to spent over £1 billion on transfer fees, wages and purchasing the club since taking over in 2008 – money which has propelled them to the FA Cup and Premier League title in recent years.

Incoming UEFA Financial Fair Play guidelines are designed to curb spending by clubs bankrolled by wealthy owners, but Watke wants the likes of City to be punished further.

'UEFA must find the thin line between sponsorship and excessive back-door funding – they must show strength to expel big clubs,' he said.

'No tycoon should be allowed to pump crazy money into a club with sponsorship from five companies he controls. If that happens, financial fair play will fail.'

Watke pointed to the example of Malaga, who currently find themselves in serious financial trouble after being taken over by middle-eastern owners in 2010, and said the Spanish side’s troubles are a warning to those reliant on cash from wealthy owners.

The 53-year-old also said that if City’s owner Sheikh Mansour offered to plough cash into Dortmund, he would turn him down.

'I would not even welcome him,' he commented.

'What if the Sheikh, as shown by Malaga, lost interest?

'The fact is that the Bundesliga has caught up considerably, thanks to their sound banking practices. This will eventually be expressed by results.’

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