No Premier League side has lost more home games in 2026 than Newcastle (7), while they have now lost 16 of their past 18 league games when conceding first.
The Magpies have failed to keep a clean sheet in each of their past 14 home league games – the longest run in their league history.
It all points to worrying times, with Jaissle just three months into a four-year contract.
“I fear a little for Newcastle,” former Liverpool and England defender Jamie Carragher said on Sky Sports.
“They have a young manager and young players. You are always going to question the manager when the team is not winning.
“I think it is going to be a tough season. At home, especially, it feels flat and boring, and I never expected to say about Jaissle’s Newcastle. You expected it to be front-footed and exciting, coming from the Red Bull model.”
Newcastle are in the bottom half of the table, with 11 points from nine games.
It was always going to be a period of transition following Eddie Howe’s exit, after five years in charge, and the arrival of 38-year-old Jaissle, after successful spells in Saudi Arabia and Austria.
In addition, Newcastle lost a number of key players in the summer including Anthony Gordon, Sandro Tonali and Bruno Guimaraes.
At the start of the year, Newcastle United’s chief executive David Hopkinson said he could put them “in the debate about being the top club in the world” by 2030.
That now seems a long way off amid suggestions the ambitions of the club’s Saudi Arabian owners, the Public Investment Fund, are running out of steam.
Jaissle was not helped on Monday by his goalkeeper, with Hornicek allowing a routine shot to squirm under his body for Thierno Barry to tap home the winner.
The Newcastle boss claimed Barry’s winner should have been disallowed for a foul on Fabian Schar in the build-up, but he conceded his players had struggled to show the bravery required to get back in the game.
“It’s almost like a negative spiral,” he said. “I’m not happy with the referee decision.
“Unfortunately we couldn’t deliver actually over the whole 90 minutes. It was not our game and our style of playing.
“That is something we are very frustrated and disappointed about. If you cannot deliver when it counts then you don’t deserve to win.
“We were not brave enough in possession, too many long balls.”
Jaissle admitted Newcastle are lacking belief in the midst of their miserable run.
“There are certain moments with not too much confidence, not only with the young lads but also with the more experienced ones,” he said.
“It’s a difficult period. We also know you can only overcome that as a unit. We worked hard and it looked good but unfortunately we couldn’t deliver.
“We will analyse in detail and try and make things better against Fulham.”