The England international has also aired his pride at reaching 300 games for the Toffees.
The duo have formed a strong working relationship at the heart of Everton’s back four, with the pair having put in solid displays in their five games together so far this season.
There is also the potential that they could be England’s central defensive pairing heading forward, having been partnered together for the win over San Marino and being in better form than the likes of Chelsea man Gary Cahill.
And Jagielka says that although they are still learning about each other, they are getting close to being able to perform on 'autopilot'.
“John and I have been able to play together for a while now,” he told evertonfc.com.
"We’re still learning a little bit about each other but that’s what it’s all about. Once you get that, you sort of go on autopilot and that’s a really good place to be. We’re getting there and that has come from playing through some tough games.”
Proud to reach Everton milestone
The Blues take on Swansea City this weekend, looking to follow up their impressive 3-1 win over Chelsea last time out.
The game will have added significance for the Toffees captain, with it likely to be his 300th for the club - the 38th player to hit that milestone on Merseyside, joining fellow teammates Leon Osman, Tim Howard, Leighton Baines and Tony Hibbert in an elite group.
And when asked about the achievement, Jagielka says playing so many games for Everton is something he takes great pride from.
“It’s great - but I’d prefer to count them up when I’m finished and see where I am then,” he added.
"It’s not something I look too much into at the moment but playing that many games for Everton is something I’m proud of and to be captain during part of that is a fantastic highlight."