The two sides meet first on Thursday 5 October at the Tingbjerg Ground, Brønshøj, kick-off 6pm local time, before moving on to Østerbro Stadium in Copenhagen the following Sunday for their second match, kick-off 2.30pm.
Lukas, who earned his first two Under-19 caps earlier this month against Sweden and Austria, joins fellow B Team defender Mads Bech Sorensen in Henrik Clausen's squad.
The 18-year-old is the eighth Brentford player to receive a call-up for next month's international fixtures alongside Mads, Justin Shaibu, Henrik Dalsgaard, Andreas Bjelland, Marcus Forss, Theo Archibald, and Kamohelo Mokotjo.