The promising teenager of Brazilian descent appears to be nearing a move to the Bundesliga champions, although his decision will only be made public "in the coming weeks"
The Germany Under-18 international has been strongly linked with a move to the Westfalenstadion after establishing himself as a key member of the 2. Bundesliga side.
"In the coming weeks, there will be clarity [on Bittencourt's future]," Wollitz is quoted as saying by Ruhr Nachrichten.
Reports in Germany suggest that Bittencourt will pen a five-year contract with Dortmund, who will pay a fee in the region of €3 million to land the midfielder at the end of the season.
The 17-year-old, who broke into Cottbus' senior squad in 2010, is under contract with the club until 2014.