Lewis Hamilton has been called to give evidence in Adrian Sutil's trial, which begins in Munich on January 30th.
Sutil has been charged with one count of causing grievous bodily harm when he allegedly stabbed Eric Lux, the co-owner of Luxembourg Investment Company Genii, in the neck with a glass.
The incident took place in the M1NT club in Shanghai where Sutil was out celebrating Hamilton's 2010 Chinese GP victory with the McLaren driver.
Sutil insists the incident was an accident, however, the Munich District Court has opted to go ahead with the case.
And one of the first witnesses will be Sutil's mate Hamilton.
"The first day Lewis Hamilton is being called as a witness," court spokeswoman Ingrid Kaps told the Hamburger Morgenpost newspaper.
"This is a mandatory appearance."