The Blaugrana assistant believes his side has suffered at the hands of officials this season after a number of controversial decisions in its 4-0 defeat to Bayern Munich.
The Blaugrana were hammered 4-0 by Bayern Munich at the Allianz Arena on Tuesday night, courtesy of a Thomas Muller double and goals from Arjen Robben and Mario Gomez.
However, Roura was left fuming after Gomez's goal was allowed to stand despite the the player appearing to be offside, and claims for a foul on Jordi Alba in the build-up to Robben's goal were also turned down.
"We have had bad luck with the refs [in] this [season's] Champions League," the 45-year-old told reporters.
Despite the misfortune at the hands of officials, Roura was quick to pay tribute to a scorching display from his German counterparts on the night.
"The first thing we have to do is to congratulate Bayern," he said. "They're very strong, a great team. Bayern played a great game, they were the better team. In the first half, we competed well, but in the second half we lacked power."