The Black Cats have the joint-worst defensive record of any side in the Premier League, after letting in 54 goals in their 29 matches to date.
Allardyce is still yet to see his team keep a clean sheet on their travel since taking charge, and their vulnerabilities at the back were exposed again last Saturday in a 1-1 draw against Southampton.
Sunderland had appeared to be on their way to a crucial victory at St. Mary’s, when Jermain Defoe scored late on.
However, despite having a numerical advantage, Allardyce’s side failed to hold on - and they allowed Virgil Van Dijk to score a last minute equaliser.
Sunderland’s failure to claim the victory has been hugely damaging to their chances of survival, and Allardyce is now intending to work even harder on the training to ground to iron out his side’s defensive deficiencies.
“Of course, the most important thing for me is they’re going to be sick and tired of defending,” he said. “They’ll be so sick of defending practices they’ll be sleeping and dreaming about it.”
Sunderland are currently in 17th place in the Premier League table, but their position is precarious.
Allardyce’s men are are just one point clear of the drop zone, with Newcastle United and Norwich City hot on their heels.