Here's the current state of play on Wearside as we reach the final 10 days of the transfer window:
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Both look like an impressive signing at League One level, especially as Batth recently won Stoke’s player of the month award in November following some solid Championship performances.
It means Sunderland now have four centre-back options again, following Frederik Alves’ return to West Ham and Oliver Younger’s permanent move to Doncaster.
That’s not including Arbenit Xhemajli who has made just one senior appearance since returning from a long-term knee injury.
The Kosovan could leave on loan this month if the right offer comes in.
What’s the latest with Jermain Defoe?
Sunderland clearly need to bring in another striker this month and are well aware of Defoe’s situation.
The 39-year-old has publically spoken about the Black Cats’ interest, yet head coach Lee Johnson appeared to play things down in Wednesday’s press conference.
League One rivals Charlton and Oxford are also believed to be options for the striker, while he could also take up a coaching role elsewhere.
The potential return to Sunderland is clearly on Defoe’s mind, as he namechecked the Black Cats during an interview on TalkSport this week.
Still, Johnson has said a lot of things would have to fall into place for a deal to go through.
What about outgoings?
Johnson has made it clear that Sunderland don’t need to sell players this month.
There has been speculation about Ross Stewart and Dan Neil, yet it would be a big surprise if they were allowed to leave.
Denver Hume has attracted interest from League One rivals Portsmouth and may depart if Sunderland can bring in cover.
Hume will be disappointed with his lack of game time this season, partly down to an injury, with Dennis Cirkin often being preferred at left-back.
Sunderland will also be looking to send a few more of their younger players out on loan.
Which other positions are Sunderland looking to strengthen?
As well as another striker, Sunderland do appear light in central midfield.
Carl Winchester could be moved into that role but that would leave a shortage at right-back which would need to be addressed.