Bremen were on the brink of signing the 20-year-old from Karlsruhe in 2012, but according to Calhanoglu they dropped their interest without even telling him.
He then joined Hamburg and made a name for himself long before last weekend's 45-yard free-kick against Borussia Dortmund.
"I'm delighted to be with Hamburg," he said.
"Back then, I felt Werder had messed me about. They didn't even call me to turn me down. But the fact Bremen didn't want me, for whatever reason, isn't bad in the end, but not to tell me was disrespectful."
Calhanoglu is likely to remain on free-kick duty following his strike last weekend, even though captain Rafael van der Vaart is back in training and set to return to the side, who are looking for a second straight win after losing seven in a row.
Bremen could also do with a win to extend their lead over Hamburg to six points.
"I know all about derbies and I know how important it is here," said their coach Robin Dutt at a press conference.
"For all the emotion, we've still got to go into the game with the right attitude. I would have nothing against the right blend of controlled aggression and attractive moves."
Dutt expects to have both Aaron Hunt and Clemens Fritz back in his squad after injuries, with both now in full training.
Assani Lukimya could also keep his place despite being substituted early on in the recent game against Borussia Monchengladbach.
"Luki is a warrior," Dutt said.
"And if he plays against Hamburg, then he will fight again."