Barcelona said on Thursday they have lodged a written complaint with Uefa over the refereeing of German official Wolfgang Stark, who took charge of Tuesday's Champions League draw with Paris Saint Germain.
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Alluding to "mistakes" in the officiating of the quarterfinal first leg, which ended 2-2, spokesman Toni Freixa said Barca "just wish to express our surprise that referees did not apply the rules in Paris."
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Barcelona insist Stark erred in refusing to let Javier Mascherano and Jordi Alba back on to the field as PSG prepared to take a corner.
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The visiting players were off the field receiving treatment after colliding with one another.
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The Catalan club say the rules of the game stipulate that the referee should have stopped play in such circumstances.
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"It is worth calling to attention that a referee at this level does not appear to know such an evident rule," Barca said in their statement.
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After the match, assistant coach Jordi Roura criticised Stark's showing and alluded to the Mascherano-Alba incident as an example. He also insisted that PSG's first goal by Swede – and former Barca star –Zlatan Ibrahimovic was offside "by several metres."
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PSG coach Carlo Ancelotti also criticised Stark for giving the late penalty which Xavi Hernandez converted for Barcelona's second goal.