The pair will meet up with their teammates next Monday ahead of games against Ukraine and Northern Ireland. Albert Capellas' side have been perfect so far in Group H of Euro 2021 qualifying with five wins from their opening five games.
They begin the return round of fixtures with a home game against Ukraine in Aalborg next Friday, 4 September, 5pm kick-off UK time, before heading to Ballymena for a game on Tuesday 8 September, 5pm kick-off.
Two wins would all-but guarantee The Danes a Play-Off spot ahead of next year's tournament in Hungary and Slovenia; the group stages for which will be played in March with the knockout stages taking place in May and June.
Right-back Roerslev has four caps at Under-21 level having started Denmark's last two Qualifying matches while centre-back Sorensen has won all three of his caps at Under-21 level during this qualifying campaign.