Phil Jagielka believes Ross Barkley can stamp his mark on this summer's World Cup in Brazil - but has urged England fans not to heap too much pressure on his Everton teammate.
Jagielka and Barkley are part of a Blues quartet who will begin their tournament preparations on Monday, with Leighton Baines and standby John Stones also set to attend a training camp in Portugal.
Much media attention has fallen on Barkley since Roy Hodgson's squad was confirmed last week and speaking at a charity event on Sunday, Jagielka said: "Ross is a fantastic player and he's obviously very frustrating to play against because he's got a tremendous amount of ability.
"I'm not 100 per cent sure what role he'll have during the World Cup but I'm sure it will be a very important one, whether it be starting or coming off the bench.
"He's grown not only as a player but as a person over these last 12 months and you can see the confidence playing pretty much week in and week out has given him. That has helped his game develop.
"But he's only 20-years-old and we shouldn't get too carried away. Hopefully there are a lot of international appearances ahead for Ross."
Meanwhile, Baines believes the selection of players like Barkley has increased public interest in the tournament, which kicks off on 12 June.
Barkley is one of a number of youngsters in the Three Lions squad, with the likes of Arsenal winger Alex Oxlade-Chamberlain, Liverpool's Raheem Sterling and Southampton's Luke Shaw also set to travel.
"We are not ranked among the favourites to go and win the competition but we are excited by some of the players that have been included in the squad," said Baines. "That’s got the nation a bit more excited about our possibilities, so we will go out there and hopefully do well."