The 21 July bomb plot trial has heard a defence claim that the shooting of Jean Charles de Menezes was because police thought he was one of the plotters.
Jean Charles de Menezes was shot dead by police on July 22 2005
A defence lawyer suggested officers had mistaken the Brazilian for the alleged Shepherd's Bush bomber Hussein Osman.
Mr Osman's defence barrister raised the suggestion during cross-examination of a detective, who responded that he was not involved in the Menezes operation.
Mr Osman and five other defendants all deny charges of conspiracy to murder.
Woolwich Crown Court heard how Mr Osman, 28, was arrested in Italy after the alleged plot to cause chaos on public transport in London on 21 July 2005.
On 22 July Mr de Menezes, 27, was shot seven times in the head as he boarded a train at Stockwell Tube station.
The suggestion of a mistaken identity was raised by Mr Osman's defence counsel, Anthony Jennings QC.
He questioned Detective Constable Dominic Murphy, who was one of the officers who searched Mr Osman's Stockwell flat and belongings.
Hussein Osman and five others deny conspiracy to murder
Mr Osman is accused of being one of four men who tried to detonate a rucksack filled with explosives on three Tube trains and a bus two weeks after the 7 July attacks.
Mr Jennings asked Det Con Murphy about a card found in the rucksack discarded by Mr Osman on 21 July which bore an address on Scotia Road - the same area which Mr de Menezes was seen leaving on 22 July.
"Are you aware police followed a young Brazilian from Scotia Road and shot him dead at Stockwell Tube station," asked Mr Jennings. "The police believed the man they had killed was Hussein Osman."
Det Con Murphy replied: "I had no involvement in that operation."
Mr Osman is one of six defendants charged with conspiracy to murder and conspiracy to cause explosions likely to endanger life.
His co-defendants are Muktar Said Ibrahim, 29, of Stoke Newington, north London; Adel Yahya, 24, of High Road, Tottenham, north London; Manfo Kwaku Asiedu, 33, of no fixed address; Ramzi Mohammed, 25, of North Kensington, west London; and Yassin Omar, 26, of New Southgate, north London.
All six deny the charges against them.
The case was adjourned until Wednesday.