"Then we want to get a full idea, talk to him frankly and honestly, asking 'is it possible to play at the World Cup?'"
Seemingly as a result of Gomez's inclusion Sandro Wagner misses out, despite an impressive season at Bayern Munich. However, Bayern's goalkeeper will be monitored during the training camp.
The 32-year-old Bayern Munich star is one of four goalkeepers named by head coach Joachim Loew, who will have to cut four names when the final 23-man squad is submitted for the World Cup finals, which start on June 14 in Russian Federation.
He took charge following that tournament in 2006 and went on to lead Germany to the final of Euro 2008, where they lost to Spain.
Defending Champions of FIFA World Cup, Germany has announced its 27-man provisional squad for the upcoming FIFA World Cup which will be played in Russian Federation.
Petersen helped his club stay in the Bundesliga with 15 goals in 32 league appearances, eight of those as a substitute.
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"We had to make a decision, and it was made in favour of [Mario] Gomez and Petersen", Low said.
Marco Reus was also selected, but Borussia Dortmund teammate Goetze was left out. Aside from the likes of Ilkay Gundogan, Sami Khedira, Toni Kroos, Julian Draxler and Mesut Ozil, there are also still places at stake in Germany's midfield - an area of considerable strength.
Borussia Dortmund's midfielder Goetze, who scored the victor against Argentina in the 2014 World Cup final, will miss the tournament in Russian Federation due to poor performances in the past season.
"I know that those players [who missed out] are just very disappointed because they worked hard for it. Sandro has shown his class when with the team".
Germany will start their World Cup campaign on 17 June, with Mexico, Sweden and South Korea in their group F.