Tammy Abraham says Wednesday's 2-1 win over Lille in the Champions League was "massive" for Chelsea.
The game look destined for a draw before Willian smashed in a world-class volley to give the Blues all three points.
It means Chelsea are equal on points with second-placed Valencia in Group H.
Speaking after the game, Abraham said: "We knew we needed to win. I knew I would get a chance and I took it well.
"Never an easy place to play and Willian scores a worldie - no surprise there.
"The manager always wants to mix things up, we can play any system. This is massive."
Willian added: "We needed to win, we have been working hard and the lads did an amazing job. Now we have to carry on."