The young Danes will face their German counterparts at the MOL Arena, Székesfehérvár, on Monday 31 May, kick-off 8pm. Should they win that game they will stay in Székesfehérvár for the Semi-Final three days later before moving to the Stožice Stadion, Ljubljana for the final on Sunday 6 June.
Both players were key parts of Denmark's perfect group stage campaign back in March. Mads Bech started all three games, scoring against Iceland on matchday two, while Mads Roerslev came off the bench for their opening day win over France before also starting against Iceland.
Mads Bech, who has featured 51 times for Brentford, is now unbeaten in nine Under-21 appearances while Mads Roerslev, who made his 34th Brentford appearance on Monday against AFC Bournemouth, has featured six times for his nation at Under-21 level.