The £8million signing of former Chelsea centre-back Papy Djilobodji is the first of "several" according to Sunderland boss David Moyes.
And Moyes says the club is looking to move swiftly in the transfer market with hopes high that more deals will be concluded "quickly" ahead of the new Premier League campaign, which starts away to Manchester City on Saturday.
Djilobodji is Moyes' - and the club's - first signing of the summer, with Sunderland looking to add four or five further additions.
The 27-year-old Senegalese international, who can also play as a defensive midfielder, has signed a four-year deal at the club.
"It’s hopefully the first of several,” said Moyes.
"There is no doubt that the squad is short and we must add to it but in Papy we have added another central defender.
"He’s naturally left-footed and that’s what I wanted plus he gives me more competition.
"I hope [he can settle straight into the Premier League] because he has good experience playing in Germany last year and he's a Senegalese international.
"He’s 27 which is a good age for us and I hope we can make him a better player, but it’s never easy coming to a new club so we need to give him some time to settle in but hopefully he will go on to be a good player.
"It’s a jigsaw and you can only put the bits in you get at the time, but I’m pleased that I’ve got the first bit in and I’m looking forward to concluding some more deals quickly," Moyes told the club's website.
Meanwhile, The Mirror report Ukrainian giants Dynamo Kiev want £10million for reported Sunderland target Domagoj Vida.
The Black Cats value the Croatian defender around the £6million mark.
Right-back and centre-forward remain the two other priorities for Sunderland though, with the club also closing in on a deal for Yann M’Vila.
Italian international Stefano Okaka, who plays for Anderlecht, has been linked along with Okaka’s team-mate Kara Mbodji.
Meanwhile, Gary Neville, who had been tipped for a role in Moyes' coaching set-up at Sunderland will return to Sky Sports this season.
The former Manchester United defender had left his role at Sky to manage Valencia but was then sacked by the Spanish side.
He left his coaching role with England in the summer after the humiliating Euro 2016 exit to Iceland and will now return to our screens as an expert analyst and commentator for Sky Sports.
Moyes has already stated he is happy with the coaching set-up he inherited but may look to add to his backroom staff in the future.