The Bulgarian President Rosen Plevneliev was quoted by the national news agency as saying that he received no advance warning of an expected attack when he held a meeting with Israel's intelligence agency, Mossad, last month.
He said that the two countries' intelligence agencies share a good relationship and that he would have acted on any lead.
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The Prime Minister will join hundreds of military personnel in Liverpool on Saturday as the country marks Armed Forces Day.
The Labour MP expects the death toll in the Grenfell fire to be well above 79 and blames the disaster on Tory attitudes to social housing.
At least 27 high-rise blocks of flats in 15 local authority areas have failed fire cladding safety tests, the Government has announced.