The Magpies were beaten 5-1 by Chelsea on Saturday afternoon.
The Magpies find themselves in the midst of a relegation dogfight again this season as a 5-1 loss to Chelsea on Saturday evening saw them drop back into the bottom three.
That result means they have now lost 10 of their 13 away games this season, with their last five trips away from St James’ Park having resulted in defeat.
The good news is that they face home games against fellow strugglers Bournemouth and Sunderland before the end of the season, and Redknapp says their home form will be key to survival this year.
"Their home form is key," he told Sky Sports.
"Their away form puts an extreme amount of pressure on them. They have got good players and I was expecting better from them.
"I had seen some really positive signs last week [against West Brom]. But the first 20 minutes was so disappointing and so abject. Everyone wants to play, when things are going well you can play, but it was a horror 20 minutes."
If Newcastle are to pick up the vital points they need in their remaining home games, they will surely be reliant on Georginio Wijnaldum to do so.
The midfielder has been impressive since joining in the summer, and is currently their top goal-scorer in the Premier League with nine to his name.
All of those have come at St James’ Park though, and they will be hoping he can add a few more to that tally against their relegation rivals in particular.