The Egyptian midfielder will link up with former Black Cats boss Steve Bruce at the KC Stadium as he looks to strengthen his squad for their Championship campaign.
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It is believed that the deal will include a recall clause that could see the midfielder return to Wearside in January if required.
Elmohamady, joined Sunderland on-loan from ENPPI in 2010 before making the switch permanent in 2011 for a fee in the region of £2 million.
The 24-year-old has made 60 appearances for the Wearsiders during his two seasons at the club and has scored one goal, netting against West Brom in the last campaign.