Dortmund moved eight points clear at the top of the table on Saturday after beating Schalke 2-1, while Bayern could only manage a 0-0 draw against Mainz.
And while winning the title remains mathematically possible, Nerlinger concedes the Bundesliga race is all but over after Saturday's results.
"Regardless of our result, the championship was decided today [Saturday], so I'm not going to read much into our result and performance," Nerlinger said.
"The players tried hard, but you could see they were hemmed in mentally. Our focus is now on the Champions League and DFB-Pokal."
Nerlinger's sentiments echoed that of coach Jupp Heynckes, who had congratulated their rivals even before they took to the field against Mainz.
"I said at yesterday's [Friday's] press conference that Dortmund can't lose it. Today's [Saturday's] game has confirmed this, they are almost champions," Heynckes told Presseportal after watching BVB beat Schalke.
"You have to say they are also worthy German champions because they have been consistent and have really focused on their next games.
"The team have played well and deserve to be German champions."
Bayern will now turn their attentions to Tuesday's Champions League semi-final first leg against Real Madrid at the Allianz Arena.