The newly-appointed club captain admits the camp is currently tentative after the Spaniard's appointment as manager, but believes the players will quickly adapt to any changes
Roberto Martinez has succeeded David Moyes at Goodison Park after the Scot joined Manchester United last month.
But Jagielka, who is the club's new captain, believes any early doubts are normal with a new manager looking to take the club in his direction.
"There is a bit of uncertainty amongst the lads," Jagielka told reporters.
"You never quite know if you're the new manager's type of player. But he mentioned me as his captain when he spoke to the press, so that was nice to hear.
"You never quite know what to expect but all you can do is keep working hard, keep doing what you do best and hope it will be enough to impress the new man."
The England man further admitted he knows little about his new manager's style or methods as a coach but is looking forward to working with the Spaniard.
"I don't know a great deal about the gaffer, but whenever our paths have crossed he always seems to be a really nice guy," he added.
"We don't know how he will do things, but that's all part of being a footballer. Managers just come and go."