Chelsea boss Rafa Benitez rates highly Europa League opponents Rubin Kazan.
Benitez has warned his players not to take victory over Rubin Kazan, who are unbeaten in the Europa League, for granted.
He said: "Some people are saying they are not very famous but they knocked out Atletico Madrid and Levante and they were doing very well.
"It's a tough game to play. People think we will score four goals but I think that will be very difficult. They are very compact, organised, solid and good on the counter-attack.
"They have [Jose] Rondon, who used to play for Malaga, and he is very strong and quick. There is also [Roman] Eremenko and he is a very good player between the lines.
"Maybe it will be difficult here [at Stamford Bridge] and hopefully in the second game we can do well."