Earlier this week police had said they wanted to speak to Abedi's brother and also said they thought others had been involved in the attack, according to Sky News.
Now Greater Manchester Police hope to speak to Hashem as part of their investigation.
A 19-year-old man has been arrested on suspicion of terrorism offences at Liverpool John Lennon airport in connection with the Manchester Arena attack.
Police investigating the Manchester Arena bombing have revealed that they suspect the suicide bomber responsible for the attack "did not work alone".
Russ Jackson, the Chief Superintendent in charge of the investigation, believes others were "aware or complicit" and they're still creating a full account about his life, beliefs and background.
"We are still working to understand the manner by which he became radicalised", Jackson told reporters at Greater Manchester Police headquarters this week. "We do however believe further arrests are possible".
Mr Jackson said police were now clear on Abedi's movements in the run-up to the attack, they knew the make-up of the bomb and where parts were obtained. "We will continue to keep you informed as much as possible on our official re-opening date and up and coming show information".
"We are now engaging with the Crown Prosecution Service and the Libyan authorities".
Police have previously revealed they believed Abedi had bought bomb parts just days after arriving in the United Kingdom from Turkey.
Salman Abedi, 22, carried out the suicide attack.
The bomber's younger brother, Hashem, was arrested in Libya shortly after the explosion, along with their father, Ramadan.