The Blues make their first trip to the former Olympic Stadium and hope to emulate most of the rest of the Premier League by upsetting the flat-cap wearing balloons who sit three miles from the pitch.
Koeman said, “They have a strong team, but the move is really difficult for them.
The strength at home – what it was – looks a little bit different now. It’s important we show the difference to us.
“They have conceded a lot of goals and maybe they’ve had some injuries at the back. They needed to change a lot of players. We know we’ll create chances against every team.
“We can do better. We can show that there’s not that difference from home and away. It’s about keeping the way you play.”