Jagielka's presence at St George's Park this week as part of an England squad gearing up for friendlies against Republic of Ireland and Brazil underlines the progress he has made since he moved to Merseyside six years ago.
"I have had two managers in my career," he said. "Neil Warnock gave me a chance to play in the game, David Moyes gave me a chance to play at a higher level, coached me to a better level and helped my game progress."
Jagielka feels loyalty is a two-way procedure, though, and in that sense he is happy with his contribution under Moyes.
He added: "Over the last six years he has taken me from possibly being a Premier League defender to playing some games for England. But I would also like to think I put myself on the line for him as well."
Moyes felt confident enough in Jagielka to name him Everton's captain when Phil Neville was slowly easing out of the first-team picture towards the end of the season.
That in itself seems strange as Moyes also felt Jagielka sometimes lacked the self-belief required to get the most from his talent.
"Obviously David saw me every day," said Jagielka. "If that was his view it can't be far off.
"I have never thought of myself as being particularly shy or lacking self-confidence but I can understand what he means.
"It is not in my character to be super confident. Once you are like that there is only one way to go. That is the way I am. I probably do play better when I am a bit more arrogant. But that is not really the person I am and I don't think it will be the person I turn into."
Source: PA
Source: PA