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Chelsea boss Frank Lampard has put his faith in a host of academy graduates this season with Fikayo Tomori, Mason Mount and Tammy Abraham becoming important Chelsea players.
The trio were recently called up to the England national squad.
Chelsea Technical and Performance adviser Petr Cech has warned Chelsea youngsters that they must continue to impress if they are to remain in the team.
“In this moment I think everyone is enjoying the moment, but obviously it all depends on performances,” Cech told Chelsea’s official website.
“This is just the start, the beginning, for them and they have to make sure they stay consistent and carry on. And then as a club we move forward, and as a team we play well.
“I have to say it’s always great when you manage to, as a club, do something with your own product, because this is always the ultimate target for everybody.
“You try to make sure that people go through your programme, you make them better, and then they actually reach the level where you can put them in the first team, you don’t have to look elsewhere.”
Cech was in Prague to watch England take on his native Czech Republic on Friday night and he is thrilled to see so many Chelsea youngsters making the step up to international level.
He added: “I’m obviously proud for the club and for everybody who contributed to their development, but I have to say though that the biggest credit goes to the players.
“If the player doesn’t have the work ethic and the heart, or he doesn’t put the hard work in obviously they never reach the heights and the level needed to be in the national team and play in the Premier League.
“As Frank said many times during the last few weeks, all these players deserve to be in his team, that’s why he’s picking them for the line-ups and the games.
“They perform, they work hard and they are performing at a level to keep their places in the team and they are also very competitive.
“It’s great as well that it helped them to go to the national teams. I think in some circumstances they have as well the chance to make their debut with the national team, which would obviously be great.
“I will see them very closely because I am going to the game in Prague, I will be at the stadium, so I hope to see some of them in action, but we’ll see how the game goes.”