Cech retired over a year ago, but has been named in Chelsea's 25-man Premier League squad for this season.
“I'm totally surprised by that," Zola told talkSPORT. “At 38 he is, especially for a goalkeeper, at an age where nowadays it is quite normal.
“Petr has got unbelievable ability and experience, but I don't know the condition of his body right now to be honest.
“But with his experience and ability as a goalkeeper there is no doubt he can do it."