| Point guard Dennis Schröder led Germany and was third overall in assists at the U18 European Championship last summer|
The two competed at the U18 European Championship last year.
Bekteshi and Schröder averaged 9.1 points and 13.5 points, respectively, for the U18 team.
Five players that helped Germany clinch fifth at the 2011 U20 European Championship in Bilbao are in Menz's team.
Theis, a 2.03m power forward/center, led Germany in Bilbao with averages of 12.7 points, 8.7 rebounds and 1.3 blocks.
On standby are Sebastian Fülle and Florian Koch.
Germany will take on France, Serbia and Montenegro in Group A at the U20 European Championship, which tips off on 12 July.
The tournament will have games in Ljubljana, Domzale and Kranjska Gora.