Panathinaikos has won the Greek Super League 20 times, making them one of the most successful clubs in Greece.
Chelsea has won the English Premier League 5 times, as well as the UEFA Champions League twice.
Panathinaikos' home stadium is the Apostolos Nikolaidis Stadium, located in Athens, Greece.
Chelsea's home stadium is Stamford Bridge, located in London, England.
Panathinaikos has a fierce rivalry with Olympiacos, known as the "Derby of the eternal enemies."\n6. Chelsea has a historic rivalry with Arsenal, known as the "London Derby."",
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