La Liga said it is filing for criminal action against the man who ran on to the pitch during Real Mallorca's behind-closed-doors match against Barcelona to try to get a photo with Lionel Messi.
The fan, wearing an Argentina shirt with Messi's No 10, breached strict security measures designed to curb the spread of the coronavirus by going onto the pitch early in the second half.
La Liga expressed its "absolute condemnation for this type of conduct that puts the health of others at risk and risks damaging the integrity of the competition."
The fan, a French Mallorca resident, revealed that he had scaled a fence to enter the stadium before half-time.
He walked calmly on the pitch in the 52nd minute and approached Barca defender Jordi Alba before heading for Messi. But the intruder was tackled by guards before reaching Messi.
La Liga Leaders Barcelona won the match 4-0, with Messi scoring in stoppage time.
Elsewhere, Napoli reached the Italian Cup final with a 1-1 draw at home to Inter Milan.
Dries Mertens cancelled out a Christian Eriksen goal to become Napoli's all-time record scorer.
The Belgian took his tally to 122 in all competitions as he overtook Marek Hamsik, with Diego Maradona third on 115.
Napoli went through 2-1 on aggregate and meet Juventus in the final on Thursday (HK time).
