Five centre-back options have produced nine different combinations at the heart of the defence for Manchester United this season.
Of course, some statistics can be misleading but we have broken down the appearances of the pairings in all competitions during Jose Mourinho's reign.
The most frequently used selection is Eric Bailly and Chris Smalling, with the duo playing together 14 times and conceding, on average, a goal a game. There was a tremendous run of four successive shut-outs when the pair performed together last month before the victory over Southampton in the EFL Cup final.