The Czech Republic goalkeeper made a rare Premier League appearance against Hull on Saturday when Chelsea won 2-0 at Stamford Bridge.
Cech, who started in the absence of the injured Thibaut Courtois, said: “We only judge the team when the season is finished and you can see how many trophies the team has in hand.
“It is difficult to say which Chelsea side in history was the best because a lot of them won trophies.
“This team has huge potential, it has been doing really well this season, we are top of the league and have been doing some brilliant games but we are empty-handed at the moment, and I don’t like to compare the teams until the season is finished.”
As for the win over Hull, Cech added: “It was not an easy one but we managed to get a good result out of that and we controlled it for most of the game because Hull didn’t have a shot on target.
“It is obviously nice to have the game time and the most pleasant part is to have the clean sheet and three points because Hull made it hard for us although we had a good start.
“We scored an early goal but for a long time in the game it was just 1-0. The second goal obviously made a big difference and with the sending off we could control the game.”