The Bundesliga outfit saw off Basel on Wednesday evening to finish second behind Chelsea in Group E.
Winger Farfan has said that his teammates are feeling confident ahead of Monday's draw for the last 16.
"I do not mind who we get. We need to beat whoever we are up against," the 29-year-old told UEFA's official website.
Schalke return to domestic action on Sunday when they play Freiburg.