Loew could well announce an expanded provisional list, like a number of other national team coaches, and wait until the June 4 deadline to reveal his final 23-man squad for the tournament.
Loew has been in charge since taking over from Jurgen Klinsmann after the 2006 World Cup.
Mario Gotze, who scored the victor against Argentina in the final four years ago, has been axed following a disappointing season at Borussia Dortmund. "I know that those players are just very disappointed because they worked hard for it. Sandro has shown his class when with the team".
However, there was no place in the squad for Arsenal defender Shkodran Mustafi, who was part of the World Cup-winning squad in 2014 and has 20 worldwide caps.
The Borussia Dortmund striker scored in extra time against Argentina in 2014 to seal Germany's fourth World Cup. He went to Euro 2016 and started in the 2-0 semi-final loss to France.
"Marco is a special weapon and has a lot of strong attributes - speed, instinct, feeling for the spaces, game intelligence".
"I have a bit of understanding that two hearts beat in the chests of players with an immigration background".
However, Loew pulled a surprise by handing a first call-up to Freiburg striker Nils Petersen, 29, the top-scoring German in the Bundesliga this season with 15 goals.
The 25-year-old scored an injury-time victor in the final four years ago as the German's saw off Argentina.
After the Federation Internationale de Football Association deadline, a player can only be replaced if he seriously injures himself 24 hours before the team's first World Cup match.