The 29-year-old will join Wanderers subject to getting approval for a work permit, only eight months after joining Wolfsburg from Bolton's Premier League rivals Stoke in January.
Tuncay said he had been lured to the Reebok after speaking to Bolton manager Owen Coyle.
"I had good talks with the manager and we spoke a lot about football and his ambitions for the club and I wanted to be part of that," Tuncay said.
Coyle said Tuncay's arrival would give his team additional experience.
"We are delighted to have secured the loan for Tuncay," he said.
"He has great experience added to the proven quality he possesses. We are pleased to have brought him to our club."
Source: AFP
Source: AFP