Deutsche Bank co-CEO Juergen Fitschen is one of five defendants in a trial starting Tuesday accused of giving false testimony in a long-running legal battle with the defunct Kirch media group.

Since the charges are of an aggravated nature, they can carry a prison sentence of anywhere between one and 10 years if found guilty.

Such a verdict would deal a deadly blow to Germany's biggest lender as it struggles to clean up its image in the wake of a long list of legal challenges in recent years.

"Things could get a little uncomfortable," 66-year-old Fitschen conceded in a recent interview with the weekly magazine Stern.

"The fatal thing is that some people have decided you're guilty from the outset. But I was honest," he insisted.

Fitschen and four others -- ex-chief executives Rolf Breuer and Josef Ackermann and former executives Clemens Boersig and Tessen von Heydebreck -- are accused of giving misleading evidence to judges in one of the lawsuits brought by the late media magnate Leo Kirch against the bank. All five have denied any wrongdoing.

Kirch, who died aged 84 in 2011, had accused Deutsche Bank of causing the downfall of his media empire in 2002 when the bank's then chief executive, Breuer, publicly questioned the group's creditworthiness in a television interview.

Prosecutors accuse Fitschen -- who has headed Germany's biggest bank alongside Anshu Jain since 2012 -- and the other defendants of giving false testimony with the aim of having Kirch's lawsuit dismissed.

Boersig and von Heydebreck, who had acted as witnesses in the Kirch trial, are accused of making unsworn false statements, which carry jail sentences of between three months and five years.

The trial, at the higher regional court in Munich begins Tuesday, with at least 16 hearings set aside until the end of September.

The 107-page charge sheet is expected to be read out on the first day, with the defendants only expected to start making their comments at the second hearing.

Besides the potential damage to Deutsche Bank's image, the bank itself could be fined up to 1.0 million euros if the court decides it participated in the deception.

The bank is currently embroiled in a several legal battles, with the accusations ranging from manipulation of the currency markets, rigging the Libor and Euribor interest rates, to doing business with countries subject to US sanctions such as Iran.

In the first three months of this year alone, the bank was compelled to set aside 1.5 billion euros to cover litigation costs, slicing first-quarter profits in half.

Just last week, Deutsche Bank was fined a record $2.5 billion by US and British authorities for its role in a vast multi-year conspiracy to rig Libor interest rates.

Fitschen and his co-CEO Jain expressed regret for the rigging, but insisted that no current or former member of the management board was found to have known about the misconduct.