Arsene Wenger believes Europa League holders Atletico Madrid could see their defence come crashing to a halt when they play Bayer Leverkusen.
Atletico travel to the group leaders knowing they must better the result of Aris Saloniki - who are at home to Rosenborg - to reach the last 32.
"This Europa League has had some interesting matches this season, and I have taken pleasure from watching it," the Arsenal manager said.
"I had lost some interest but this year I find it really good.
"Atletico won last year's Europa League and are back in the competition. The team is suffering a bit in in the national championship. There is a lack of stability. So personally, I think they are in danger in Leverkusen."
Wenger is also looking forward to the climax of Group J, with Paris Saint-Germain, Sevilla and Borussia Dortmund all vying for qualification.
"When you watch this group you could think that the three teams could all be in the Champions League next year.
"Dortmund is focusing the most of its energy on the national championship, they have a 16-point margin ahead of Bayern Munich which is impressive.
"They are the team with the best total league points in Europe, so subconsciously they may relax in the Europa League."
Watch the video to hear all Wenger's thoughts.