The on loan Chelsea youngster made his senior bow for the Millers in their 1-0 triumph over Brentford at the weekend and received an official call-up for England duty this week.
Aidy Boothroyd’s Young Lions secured their place at next summer’s competition in South Korea after reaching the semi-finals of the U19 Euros in July.
And the U20s head coach has selected a 23-man squad as the build-up begins with a warm-up game against the South Americans at St. George’s Park before they head to the Aggborough Stadium on Sunday 4 September.
The majority of the squad who featured throughout last season’s U19 Euro campaign are included in Boothroyd’s squad, but there are also a number of recalls for players who have previously featured with England’s younger age groups.
Manchester United goalkeeper Dean Henderson returns to the group, after previously featuring at U17 level in 2014, while his Old Trafford squad-mate Axel Tuanzebe is selected having joined up with the U19s for their pre-Euro games with Mexico earlier this summer.
Everton midfielder Kieran Dowell is also included after last representing the U18s in their games with Russia in June 2015.
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Goalkeepers: Dean Henderson (Manchester United), Luke Southwood (Reading), Freddie Woodman (Newcastle United)
Defenders: Cameron Borthwick-Jackson (Wolverhampton Wanderers, loan from Manchester United), Callum Connolly (Everton), Dael Fry (Middlesbrough), Jonjoe Kenny (Everton), Taylor Moore (Bristol City), Fikayo Tomori (Chelsea), Axel Tuanzebe (Manchester United), Kyle Walker-Peters (Tottenham Hotspur)
Midfielders: Lewis Cook (AFC Bournemouth), Kieran Dowell (Everton), Ryan Ledson (Everton), Ainsley Maitland-Niles (Arsenal), Joshua Onomah (Tottenham Hotspur), Reece Oxford (West Ham United), Jordan Rossiter (Glasgow Rangers)
Forwards: Tammy Abraham (Bristol City, loan from Chelsea), Adam Armstrong (Newcastle United), Isaiah Brown (Rotherham United, loan from Chelsea), Ademola Lookman (Charlton Athletic), Patrick Roberts (Celtic, loan from Manchester City).