Inkai Pena made his first start of the season for Barcelona against Rayo but couldn’t keep a clean sheet as the visitors were held to a 1-1 draw.
The youngster came in for the injured Marc-Andre ter Stegen but was beaten by Unai Lopez for the opening goal five minutes before half-time.
Xavi complained about the goal after the match, insisting it should have been ruled out for offside, but Pena didn’t really want to get drawn into a debate about the strike.
“We knew that they, with crosses and high pressure, make it difficult for the opposition.