Conor Gallagher has been called up for the fixtures against Austria and Slovenia.
Had been named in the England U20 squad of Keith Downing for their games from Italy and the Czech Republic.
Gallagher, 19, has scored four goals in 11 appearances for the Addicks, together with his most recent goal.
He becomes the fifth player out of Chelseas academy to link up with the U21 team, although four Chelsea gamers are in the England squad.
The call-up of gallagher follows Morgan Gibbs-White, Mason Greenwood and Reiss Nelsons entrance through harm. He unites Swansea City set Sam Surridge along with Ben Wilmot as fresh developments to the squad of Aidy Boothroyd
Prior to travelling to Maribor to play Slovenia in the Ljudski vrt arena on 25, england U21s are training in St Georges Park.
They will then keep their Euro 2021 qualifying effort against Austria.
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