Celtic's defence looked particularly porous at the start of the season.
The Bhoys started the campaign in disjointed form, and they looked vulnerable in defensive situations, conceding five times in their opening three Scottish Premiership games of the season.
However, since then Celtic have started to tighten up at the back, and Gordon believes hard work off the field is paying dividends, with Ronny Deila's men having collected back-to-back clean sheets in their last two games.
CG: We’re working very hard on our defence and we’re off the back of a couple of clean sheets just now which is always pleasing.— Celtic Football Club (@celticfc) September 24, 2015
Celtic have won their last two fixtures comfortably, beating Dundee 6-0, before backing that result up with a 2-0 success over Raith in the League Cup.
It is a sign that they are starting to find their feet, and it is not too much of a surprise to discover that there were some early teething problems defensively.
Celtic lost both Jason Denayer and Virgil Van Dijk, who were their first-choice centre-backs last season, over the summer, and they have had to bring in a number of players in an effort to replace them.
The likes of Tyler Blackett, Jozo Simunovic and Dedryck Boyata were all brought to Parkhead in the last transfer window, and it seems that they are starting to settle in their new surroundings.