The starting back four for the must-win match against Reading at Carrow Road will have netted 10 goals between them this season.
Scotland international Martin said: "That's not a bad statistic if you are a defender.
"But it shows how good we have been at set pieces this season. We work on them a lot in training, getting the ball in right and then attacking it.
"It's not fair to be too harsh on our strikers because for most of the season we have been playing one up front.
"But whoever has played has really put a shift in and the lack of goals isn't down to any lack of effort.
"We might need to get a better balance between the defence and the attack next season."