Sutil had apologised during the opening day of the trial on Monday.

"I am terribly sorry, I did not want that to happen," Sutil told the district court in Munich, southern Germany.

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The nine-centimetre-long (four-inch-long) cut on Lux's throat required 24 stitches, according to prosecutors, who had offered a suspended sentence of one year in exchange for a guilty plea. Sutil refused.

The driver told the court that he had attempted on several occasions to contact Lux to apologise but that the executive had repeatedly rebuffed him and threatened him with lasting damage to his racing career.

Lux, who was not in the courtroom when Sutil testified, said later that he wanted the driver to say he was sorry in person.