Roy Hodgson is overseeing the youngest England squad in a competitive tournament for 58 years, with an average age of 25 years and 10 months.
"They are young, daring, very dangerous in attack and they defend very well," Capello, who led England from 2008 until 2012, told Spanish newspaper Marca.
"They are a national team without experience. We shall see how far they go."
England went into the tournament with five wins in their previous six games. They finished second in Group B after a victory over Wales and draws with Russia and Slovakia.
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Hodgson, who took over from Capello, led England to the quarter-finals of Euro 2012 where they lost to Italy on penalties.
They were eliminated from the 2014 World Cup two years later at the group stage.
(Reporting by Adriana Garcia, editing by Ed Osmond)
