There were no less than four new arrivals at the Academy of Light on Friday evening with some high-profile exits too after Ross Stewart, Danny Batth, Lynden Goocg and Elliot Embleton (loan) all departed the club.
With all the summer incomings and outgoings in mind, we take a look at just one of the ways Tony Mowbray could line up when every player – including new signings – is fit and available to play and take a look at Sunderland’s squad in general.
Take a look at Mowbray's new-look Sunderland starting XI and squad after a crazy deadline day of transfer signings and exits:
. GK: Anthony Patterson
The goalkeeper hasn't missed a Sunderland league game for quite some time now. Photo: Clive Mason
. RB: Timothee Pembele
French defender Timothee Pembele has signed for Sunderland on a five-year deal. Photo: ROMAIN PERROCHEAU
. LB: Dennis Cirkin
The former Tottenham Hotspur left-back has proved his quality in the Championship under Tony Mowbray. Photo: Clive Mason
. CB: Luke O'Nien
Sunderland's Mr Versitile is heavily favoured by head coach Tony Mowbray Photo: Andrew Redington
. CB: Dan Ballard
The defender showed how good he can be last season but was hampered by injuries. Sunderland fans will be hoping the former Arsenal man can stay fit. Photo: Frank Reid
. CM: Pierre Ekwah
The former West Ham midfielder is beginning to find his feat on Wearside after a string of impressive performances towards the end of the season. Photo: George Wood
. CM: Dan Neil
The former Academy of Light starlet has been ever-present for Sunderland in the Championship under Alex Neil and Tony Mowbray. Photo: Tony Marshall
. LW: Jack Clarke
The former Leeds United and Tottenham winger has been heavily linked with Burnley, Brentford and Crystal Palace with Sunderland having offered him a new contract. Photo: Frank Reid
. CAM: Adil Aouchiche
The French attacking midfielder has signed a five-year-deal at the Stadium of Light. Photo: JEAN-FRANCOIS MONIER
. RW: Nazariy Rusyn
The Ukrainian forward has now joined Sunderland and can play up front and across the forward line. Photo: Michael Regan
. ST: Mason Burstow
The Chelsea striker has joined Sunderland on a season-long loan. Photo: JUSTIN TALLIS
. Potential substitute: Nathan Bishop
The Manchester United goalkeeper has now joined Sunderland during the summer transfer window. Photo: Ash Donelon
. Potential substitute: Adam Richardson
The young goalkeeper has played twice during pre-season so far. Photo: FRANK REID
1. GK: Anthony Patterson
The goalkeeper hasn't missed a Sunderland league game for quite some time now. Photo: Clive Mason
2. RB: Timothee Pembele
French defender Timothee Pembele has signed for Sunderland on a five-year deal. Photo: ROMAIN PERROCHEAU
3. LB: Dennis Cirkin
The former Tottenham Hotspur left-back has proved his quality in the Championship under Tony Mowbray. Photo: Clive Mason
4. CB: Luke O'Nien
Sunderland's Mr Versitile is heavily favoured by head coach Tony Mowbray Photo: Andrew Redington