West Ham United manager David Moyes admits he has concerns about Silkeborg's artificial pitch.
The Hammers travel to Denmark for their second Europa Conference League group-stage match.
Moyes' side won their opening game against FCSB last week, and they must overcome a tricky situation on Thursday to make it two from two.
"It's given me some thoughts," Moyes said. "We respect that it's an artificial pitch, we have some decisions to make.
He added: "As a player, I played on a plastic pitch for three years. In modern football, I don't see the top level players really wanting to play on astro turf pitches and I completely respect it.
"I'm from Scotland and I know how important astro turf pitches are."