UPDATE 1-Porsche to debate 5 bln eur Qatar stake buy -source

* Carmaker calls special board meeting on July 23

* Porsche management concludes talks with Qatar - source

* To discuss possible sale of Porsche AG stake in VW

* Porsche shares up 1 pct

(Adds background, analyst comment, share price)

STUTTGART, Germany, July 10 (Reuters) - Indebted automotive holding group Porsche SE (PSHG_p.DE) has called a special board meeting to discuss Qatar's possible investment worth around 5 billion euros ($6.97 billion), a source said on Friday.

The source said the extraordinary supervisory board meeting was scheduled for July 23.

The Stuttgart-based group's board will also debate on that day a possible sale of a 49 percent stake in its wholly owned sports car unit, Porsche AG, to Volkswagen (VOWG.DE), the person added. Porsche SE, which controls 51 percent of VW's voting stock, confirmed that Chairman Wolfgang Porsche has called an extraordinary supervisory board meeting for July 23.