Lakeside Hammers rider Tomasz Jedrzejak has been ruled out of the Elite League play-offs.
The Pole, who only signed for Lakeside at the start of September and has yet to make his debut, sustained an ankle injury racing in Sweden on Tuesday.
The Hammers will use 'rider replacement' (when a missing rider is replaced by another from his team) in Jedrzejak's absence.
Lakeside will also be without Adam Shields and Piotr Swiderski for the fixture.
The return leg is on Monday, September 26th.