Barcelona goalkeeper Jose Manuel Pinto was hit in the head by a baguette in their 3-0 win over Deportivo Alaves on Tuesday night, according to the referee's report.
The breadstick was thrown by opposition fans as Barca cruised into the last 16 of the Copa del Rey thanks to goals from David Villa, Andres Iniesta and Cesc Fabregas.
Referee Jose Antonio Teixeira Vitienes wrote in his match report: "Numerous objects were thrown from behind the visitor's goal.
"A bit of baguette lightly struck Pinto and without him needing to receive medical attention, [I] allowed the match to continue."
The Segunda division side have yet to discover their punishment from the Spanish FA.