The Hammers secured a place in the knockout stage with a win over Anderlecht at London Stadium.
The two first-half goals from Said Benrahma and Jarrod Bowen were enough for them to make it four wins from four.
If they get a point from their final two games, they'll be in the last 16.
West Ham were too good for Anderlecht, with Wolves loanee Fabio Silva barely making an impact.
Benrahma's well-taken free-kick gave the hosts the lead before England World Cup hopeful Bowen drove home his third European goal of the campaign and his sixth in the last two seasons.
The police were called in after rival supporters threw seats at each other.
Two years after his arrival, Benrahma is still not performing well for West ham.
The Algerian is capable of brilliance but his end product doesn't match the approach work as frequently as he would like.
The 14th-minute opener was excellent. He caught his free- kick from a central position. The Anderlecht wall broke too early and he was aided by it.
One of those annoying moments came in the second half. Ben Johnson was forced to run back and retrieve after Benrahma overhit his cross.
It is difficult to see how Benrahma will get a place in the first-choice line-up.
There's more to come.