The Hammers have generally built their success upon a solid defensive unit under Allardyce, but he has been frustrated by the porous nature of his backline this term.
The experienced boss says that although the attacking play of his team has unquestionably improved this season, he would have liked them to have shut the opposition out on more occasions.
"We’re a much more fluent and attacking side," he said. "We’ve scored more goals and our only problem has been the lack of clean sheets. We’ve only got seven, and if we are going to be a top eight side we need to improve on that.
"We should be in double figures by now, this time last year we had 13 clean sheets. Now we’ve only got seven and it’s a major reason why we’ve failed to win recently."
It shows the challenge that Allardyce will have at West Ham, if he is offered a new contract, as he will need to ensure that their current attacking ethos stays, while enhancing the team's defensive quality.
Hammers supporters urged Allardyce to make the team more entertaining and, although he has completed that requirement, he still doesn't seem entirely satisfied with the way the team have played this season.
West Ham fans also have had their disappointments about the campaign, with the side's recent results being particularly frustrating.
The Hammers had looked in with a chance of challenging for the top-four over the early part of the season, but they have struggled in 2015 and their bad run of form, ultimately, may be what costs Allardyce the chance to tighten things up next season.