By ESPNSTAR.com staff
Wolfsburg dealt Dortmund's hopes of winning a third consecutive Bundesliga title a severe blow at the Westfalenstadion stadium, with goals from Diego, Naldo and Bas Dost sufficient to give the away team the victory despite Die Borussen replying with efforts from Marco Reus and Jakub Blaszczykowski.
However, Wolfsburg's win was not without controversy, as Stark not only sent Dortmund defender Marcel Schmelzer for stopping a goal-bound effort off the line with his hand but also awarded a penalty to Die Wolfe, from which Diego duly converted.
Replays show that Stark made the wrong decision, and a fuming Klopp was unequivocal in his criticism of the 43-year-old referee, claiming that the dismissal of Schmelzer, along with the penalty, changed the outcome of a game Die Borussen were initially dominating.
"The consequences were bizarre," Klopp told reporters after the game.
"We were 1-0 ahead and Wolfsburg had no chance and then comes the game-winning move.
"It was a brutal decision. The boys have to chop their hands off to avoid risking a handball.
"I had everything taken into account, including the penalty. But the red card decided the game today [Saturday].
"Until then we were vastly superior."
Stark himself acknowledged that he had made a mistake and apologised to Klopp for costing him the game.
"I've looked at it again later and unfortunately it was an error of perception on my part," Stark admitted.
"I'm sorry, that should not happen. The penalty and the red card were a mistake on my part. That's annoying."
Dortmund are currently third in the table, 14 points behind league leaders Bayern Munich, and will take on struggling Hoffenheim in their next Bundesliga fixture.