European football’s governing body UEFA said it is open to discussing changing the rules on penalty kick reviews after Argentine star Julián Álvarez’s disallowed penalty shot sparked controversy on Wednesday. 

Spanish football giants Real Madrid beat Álvarez’s team, city derby rivals Atlético Madrid, in a penalty shoot out after tying 1-1 on aggregate, claiming a spot in the UEFA Champions League. Álvarez had a penalty disallowed after the VAR determined that he’d touched the ball twice — a call that could have changed the outcome of the match.

Álvarez’s turn to take the kick came with the shootout tied 1-1. As he stepped up, his standing foot slid, causing him to slightly touch the ball before kicking it. The shot went in, but referee Szymon Marciniak disallowed it on the grounds that the rules do not allow players to touch the ball more than once during penalty kicks.

On Thursday, UEFA admitted the contact had been slight, and said it’s open to reviewing the rule.

“Although minimal, the player made contact with the ball using his standing foot before kicking it,” it wrote in a statement. “UEFA will enter discussions with FIFA and IFAB [the International Football Association Board] to determine whether the rule should be reviewed in cases where a double touch is clearly unintentional.”

The decision required the VAR because the touch was so slight, and proved highly controversial.  

Atlético Madrid head coach Diego Simeone argued he’d never seen the VAR warn the referee about such an incident and claimed the ball didn’t move when Álvarez allegedly touched it.

“Raise your hand if you saw [Álvarez] touch the ball twice,” he told journalists at the post-match press conference. “See, nobody raised their hands.”

Álvarez admitted he wasn’t sure whether he had touched the ball when he slipped.