The promising Belgian goalkeeper has again been in fine form during his third season-long loan spell with Atletico Madrid and is tipped to replace Cech at Stamford Bridge when he comes back in the summer.
However, the Czech Republic international says he can't afford to think about that as he focuses on the job at hand with the Blues.
"It is the decision of the club," he told isport.blesk.cz.
"The only thing I can do is to perform as best as possible and convince the coach that I still deserve the position in the goal.
"I have been here for almost ten years and there has been plenty of speculation on that. I can think of the names of 20 goalkeepers (linked to the club) in all that time.
"I'm used to that and not really worried because, anyway, everyone is on the same starting line at the beginning of every summer.
"We will see in the summer. I don't feel any extra pressure. When the day comes when someone comes and is better than me, then it will happen.
"As I mentioned before, the speculation has been here all the time. I am just trying to do the same and won't change."
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