Cech believes Sparta Prague have more than enough quality to cause Chelsea problems, and feels we will need to keep a close eye on two of their most recent additions.
"The game against us will be their first competitive match since December," Cech told chelseafc.com.
"They recently signed David Lafata, who has been the top scorer in the Czech Republic for the past two seasons, as well as Roman Bednar, who used to play for West Bromwich Albion.
"They will have options, and they are a team with a good blend of young, hungry players and experienced ones.
"For them, it will be the biggest game of their careers, so that's a danger because they will want to show they can do well against us."