That's the value until somebody decides to pay more, as is always the case with Transfermarkt, who tend to be conservative with their valuations even then. They updated their valuation of Anderson 10 days ago at 110m euros so less than £100m and thus nearly £20m less than Citeh are paying for him.
The rumours re Chelsea suggest they're offering 100m euros so £90m for Wharton, but given our 'relationship' with Chelsea, who knows.. If true, take it and move on. With the two window ban for registering players, Chelsea need to do their business in this one. However, I have my doubts that they really do want Wharton.
PS. Yes, this latest set of posts really ought to moved to the Wharton thread.