A drone carrying a flag opposing Euro 2020 matches in Bilbao interrupted Athletic Bilbao's match at home to Eibar in La Liga on Saturday.
Play had to be halted in the 68th minute of the 1-1 draw while referee Valentin Pizarro Gomez picked up the drone and accompanying flag and carried it off the field before restarting the game.
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Bilbao is one of 12 host cities chosen to hold games at the rescheduled European Championship and is due to host all three of Spain's group stage matches, which will be the first time the national team has played in the Basque Country since 1967.
The move has been opposed by separatist-leaning groups and political parties, who do not want Spain to play on Basque soil.
Opposition to hosting the tournament in the city has increased since the prospect of hosting matches without supporters has grown stronger due to the coronavirus pandemic.