Wednesday have conceded just 43 goals in their 41 matches so far this season - a figure only one team can beat - and Gray is proud of that fact.
Worryingly for Wednesday, this defensive solidarity has evaporated in recent weeks, where they have conceded nine goals in their last five games, and Gray is determined to ensure that his side get back to their best before the end of the season.
"We have kept 16 clean sheets and that has been one of our big successes but we are just gifting teams goals at the moment," he said.
Negating their defensive success, Wednesday have struggled to score goals this season and this is an area that they will need to improve next term.
No Owls player has managed to get into double-figures for league goals over the season and a striker is likely to be at the top of Gray's wishlist for the summer.
The Yorkshire outfit have funds to spend, with Dejphon Chansiri recently taking over the club, and expectations will be raised next season.
Wednesday will be amongst the promotion favourites and Gray will need to make sure that he keeps the side defensively compact, but enhances their attacking quality if he is to guide the club into the top six.