Sheffield Wednesday youngster leaves on loan - and might not be back
The 23-year-old could not have played senior football again for the Owls in 2023 as he was not registered on their 25-man squad list for the first half of the Championship season by previous manager Xisco Munoz.
With only 24 names included, Danny Rohl could have added him, but decided instead to go for experienced winger Marvin Johnson.
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Hide AdThere has always been much talk of the Republic of Ireland youth international's potential, but it has only translated into 18 appearances for the Owls first team. He has had loan spells with Notts County and Swindon Town.
A shoulder injury picked up at the end of last term stopped him pressing his claims to new manager Munoz in pre-season, and the Spaniard brought in senior centre-backs Di'Shon Bernard and Bambo Diaby.
With Brennan's contract up at the end of the season, the Owls are thought to be open to the idea of him moving on permanently when the transfer window opens in January.
Hartlepool are 12th in the Conference and are at City of Liverpool in the FA Trophy on Saturday, when Brennan could make his debut.