article_snippet.sent: 18 - Celtic, Chelsea .
article_snippet.sent: 17 - Manchester United, Bayer Leverkusen, Arsenal .
article_snippet.sent: 16 - Panathinaikos, Lyon .
article_snippet.sent: 13 - Shakhtar Donetsk, Spartak Moscow, Paris Saint-Germain .
article_snippet.sent: 8 - Sporting Lisbon, Werder Bremen, Newcastle United .