The knockout phase of the 2008–09 UEFA Champions League began on 24 February 2009 and concluded with the final at the Stadio Olimpico in Rome on 27 May 2009. The knockout phase involved the 16 teams who finished in the top two in each of their groups in the group stage.

Panathinaikos Football Club, known as Panathinaikos, or by its full name, and the name of its parent sports club, Panathinaikos A.O. or PAO, is a Greek professional football club based in Athens, Greece.