We have conceded the same number of goals as the league winners this season, so it seems that the defence is not our problem.
Lol you are so gassed, defence is definitely our problem.
Any team that concedes three to West Brom twice, Villa, Stoke, Young Boys, Southampton, etc etc has significant defensive problems.
Between them, the CM and CB pairings are just not giving us enough defensive stability, and changing the CB pairing is the easiest way to improve this.