The force assisted colleagues from South Yorkshire Police in the execution of a search warrant of an apartment owned by Sir Cliff.
No-one has been arrested.
Sir Cliff was not in the property at the time and has denied allegations of "historic impropriety". In a statement yesterday, the veteran singer appeared to suggest that police had tipped off the press about the search warrant.
This seems to have prompted Thames Valley Police's statement today (Friday). In it, they said: "Thames Valley Police did not speak to any media outlets prior to the warrant being executed in Sunningdale, Berkshire, yesterday.
"This is a South Yorkshire Police investigation and local officers from Thames Valley Police assisted South Yorkshire officers in their search of the property."
In responding to the raid on his home and denying any allegations, Sir Cliff said in his statement:: “For many months I have been aware of allegations against me of historic impropriety which have been circulating online. The allegations are completely false.
“Up until now I have chosen not to dignify the false allegations with a response, as it would just give them more oxygen.
“However, the police attended my apartment in Berkshire today without notice, except it would appear to the press.
“I am not presently in the UK but it goes without saying that I will cooperate fully should the police wish to speak to me. Beyond stating that today’s allegation is completely false it would not be appropriate to say anything further until the police investigation has concluded.”