"The DFB of course respects the special situation for our players with migrant backgrounds, but football and the DFB stands for values that Mr Erdogan does not sufficiently respect", DFB president Reinhard Grindel said. That's why it's not good that our global players let themselves be manipulated for his electoral campaign.
Mr Erdogan faces re-election next month and has been accused of using his 3-day visit to the United Kingdom to campaign for the votes of expatriate Turks.
"As German internationals we adhere to the values upheld by the DFB and we are aware of our responsibilities", added Gundogan.
Ties between the European Union and Turkey are increasingly strained, with Brussels saying that Erdogan is leading his country away from the path to membership, while some Turkish officials say they feel betrayed by some the bloc's leaders.
Cem Ozdemir, former leader of the German Green party and himself of Turkish origin, was also scathing.
Cem Ozdemir, the former head of the Green party, told SID that the "president of a Germany global is [Federal President] Frank-Walter Steinmeier".
German national team manager Oliver Bierhoff said he would raise the issue with the players.
"They were unaware of the symbolism of these pictures, but we can not endorse it, and we will discuss the matter with the players".
Investors hammered Turkey's lira on Tuesday, sending it to a record low after President Tayyip Erdogan said he plans to take greater control of the economy after next month's election, deepening concerns about his influence on monetary policy.
"The thoughts expressed by the DFB president are absolutely unacceptable", Demiroren said in a TFF statement.
Turkish football federation vice-president Servet Yardmici, an executive member of the UEFA Board, claimed Erdogan's meeting with the players was centred on "football chat".
Here are the players that most helped Germany waltz through World Cup qualifying and who will be called on to defend their title.
Speaking at a forum on Turkish-British relations, Erdogan noted that in July 2016, the British government quickly condemned a coup attempt against him and said "we will never forget this solidarity". Footballers of any nationality will always be welcomed by our president, especially when they are the ones who want to have such a meeting.
"But I am also sympathetic towards them".