West Ham defender Vladimir Coufal said they "want the bonus" of qualifying for the knockout stage of the Europa League with two games to spare.
A fourth win from four matches could see West Ham progress when they take on Genk on Thursday (17:45 GMT).
They are currently six points clear of the other three teams in Group H.
"That's very important for us because our schedule is unbelievable now so we can have one game less if we win the group," said Coufal.
"It's a good bonus for us and we want to get this bonus.