The winger has praised the experienced midfielder ahead of Wednesday's final and believes the Blues are a very different team to the one that won the Champions League last term
Lampard became Chelsea's all-time top goalscorer at the weekend following his double against Aston Villa and John has nothing but praise for the England international.
"Lampard is obviously a good player. He's been there a long time and can change a game," John said at a press conference.
"But the Chelsea team as a whole are good - we have to be wary of all of them."
The Netherlands international then went on to stress that Chelsea are nothing like the team that won the Champions League last term with Didier Drogba up front, while admitting that it's a special feeling for him to play the final in Amsterdam.
"Chelsea are different to 12 months ago. They are younger and now there's no clear target man, it's a different style. They're in the final and they're not here for nothing.
"The final is extra special but I don't think that means I'll be extra nervous. Excited but not nervous - I've played big games before."
Wednesday's encounter is scheduled to kick off at 20:45CET.