The Magpies manager wasn't backed in the summer, leading to speculation he could leave St. James' Park. But Jenas doesn't believe the Spaniard will walk out.
"Look, Premier League jobs don't come easy and he's got one. There are plenty of managers out there who haven't and are chomping at the bit to get one. I don't see him walking away or the club sacking him because I don't think they can - he is key to this team staying in the Premier League," Jenas said.
"The thing with that [style of play adopted against Man City] is that Rafa is that type of manager - where ever he's been, that has been his style; that is how he likes to manage a club. I don't think it's just down to personnel."