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A request has been lodged in Iran's top court to review the death sentence of an academic convicted of spying for Israel, his lawyer said Wednesday, citing "flaws" in the case.

Ahmadreza Djalali, an Iranian emergency medicine specialist resident in Sweden, was arrested during a trip to the Islamic republic in April 2016.

The academic was found guilty in October of allegedly passing information about Iranian nuclear scientists to Israel's Mossad intelligence agency.

Lawyer Zeinab Taheri told AFP that "we have asked for the verdict to be re-examined" due to what she described as "many flaws in the case".

The request was filed to the Iranian Supreme Court some 10 days ago, she said.

"We are hopeful that the verdict will be overturned," the lawyer added.

Taheri said she was concerned about the health of her client, who has taught at Belgium's Vrije Universiteit Brussel.

"He is not at all in good physical condition, even though he is eating well he is getting weaker and losing weight each day," she said.