Two men, Leicester brothers Babu and Bharat Sarasia, are serving 25-year and 18-year sentences respectively for their roles in the crime.
Mr Sahnan, who is thought to have played a leading role in the conspiracy, disappeared before his alleged co-conspirators were put on trial.
His whereabouts are unknown and he is listed as one of the UK's most wanted.
Det Con Kevin Hames, who led the investigation into the smuggling operation, spoke out after the Sarasia brothers appeared in court last week following an investigation into their finances.
He said: 'I have another 15 years or so of my career left and I will not stop looking for Mr Sahnan. This is not the end of this investigation.'
The Sarasia brothers were jailed after police and customs officials intercepted an 18kg consignment of heroin in July 2007.
However, police believe the gang, of which the brothers were key members, had smuggled nine consignments of the drug to the city.
The potential street value of the 10 smuggled lots is thought to exceed £12 million.
Mr Sahnan, who has links to the West Midlands and London and is not from Leicestershire, is thought to be overseas.
At one point, officers thought he might have fled to Spain, possibly in the Alicante region.
His photograph was circulated in the area two years ago in the hope that holidaymakers or expatriates would recognise him.
However, the 51-year-old, who wears a hearing aid in his right ear, remains at large."
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