The alleged crimes are believed to have happened in the Pendleton and Charlestown areas of Salford.
Officers have now released a CCTV image of a man they want to speak to as part of their investigation.
A Greater Manchester Police spokesperson said: “The Salford Central Neighbourhood Team are looking to identify the male below in relation to drug dealing offences in the Pendleton and Charlestown area and we are asking for your help.
An investigation is underway (Image: GMP)
“If you recognise this male by his distinctive clothing, we ask that you please contact Sgt Atherton via 13490@gmp.police.uk.
“There is no requirement for you to provide any personal details regarding yourself, and all information you provide to us will be held confidentially.”
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The image released by police appears to show a man wearing a black face mask with blue trousers and a blue coat stood in a black electric bicycle.
As well as the email address provided, anyone with any further information or concerns can also call police on 101 or 999 in an emergency.
Alternatively, witnesses can call independent charity Crimestoppers anonymously on 0800 555 111
