Arsenal manager Mikel Arteta could decide to go back to a four-man defence for this week's Premier League clash against Crystal Palace.
In their London derby against Chelsea over the weekend, the Gunners secured one of their best results of the season as they won 1-0 at Stamford Bridge thanks to a solitary goal from Emile Smith Rowe.
In that one, Arteta recognised that his side would not have as much of the ball as Chelsea and so opted to deploy three centre-backs flanked by wing-backs.
As Arsenal will be on the front foot against Palace, who will likely sit in, the Spaniard could move back to a back four of Callum Chambers, Rob Holding, Gabriel and Kieran Tierney.
David Luiz is likely not fit enough to start, and could have played his last game for the club, with the Brazilian set to leave this summer at the expiration of his contract.
Bukayo Saka struggled at right wing-back against the Blues, but moving back to a 4-2-3-1 formation will allow him to take up his spot down the right wing again.
Mohamed Elneny and Thomas Partey screened the defence excellently and should retain their places, especially with Granit Xhaka struggling for fitness. Dani Ceballos will likely have to settle for a place on the bench.
Smith Rowe and Martin Odegaard will make up the attacking midfield three alongside Saka, while Pierre-Emerick Aubameyang should lead the line.
Willian, Alexandre Lacazette, Gabriel Martinelli and Nicolas Pepe will provide options from the bench.