They are the 35-1 outsiders that are generally viewed as Group Stage fodder, perhaps regarded by the likes of Andrea Agnelli as too small to even entertain the notion of reaching a Champions League quarter final.
But Porto are alive and kicking and ready to serve up another shock on European football's big stage.
Sergio Conceicao's side entertain Thomas Tuchel's Chelsea in Sevilla, but can the fiery Portuguese coach keep his cool and help the Liga NOS side reach their first semi final since 2003-04? Sportsmail provides the lowdown on this season's underdogs.