The Black Cats have shown signs of progression under Allardyce’s stewardship so far, but they have regressed in recent weeks.
In particular, Sunderland’s performances against Watford and Chelsea in their last two outings have been poor. And Allardyce said: "I've had a while to look at it and I'm disappointed in the lack of consistency.
"We have seen some good things, back-to-back wins which has given us the opportunity to go forward.
"Now we have dropped back in the mire again by our lack of results.”
Sunderland had won against Crystal Palace and Stoke City to get themselves out of the relegation zone.
However, they have now lost their last three matches on the bounce and they have undone some of their hard work.
Sunderland’s 3-1 defeat against Chelsea on Saturday was arguably their worst performance under Allardyce so far and it leaves question marks over their squad.
Sunderland are five points away from safety, meaning that there is plenty of work to be done if they are to start moving away from trouble.
Sunderland’s next match comes against Manchester City on Boxing Day, before they face a home fixture against Liverpool on December 30th.