Lionel Messi had a record seven shots on target without scoring in Barcelona's 3-0 Champions League defeat to Juventus, which Antoine Griezmann acknowledged must be a wake-up call.
Messi was heavily involved as Barca attempted to mount a comeback on Wednesday morning (AEDT) after conceding twice in the first 20 minutes of a Champions League home match for the first time.
The superstar captain had more touches (125) and contested more duels (19) than any other player on the Camp Nou pitch.
Messi also sent in 11 shots, seven of which hit the target, but he could not beat veteran Juve goalkeeper Gianluigi Buffon, whose shirt the former took away at full-time.
Instead it was old rival Cristiano Ronaldo who carried his side to the top of Champions League Group G, scoring two penalties either side of Weston McKennie's volley.
Those were Ronaldo's first goals against Barca in the competition after drawing a blank on five occasions.
It was Messi's turn to fall short in front of goal as, since Opta records began in 2003-04, no other player has had seven efforts on target without finding the net.
However, Messi was the only Barca player to actually test Buffon, with eight of the nine attempts from his team-mates missing the target and Martin Braithwaite seeing the other blocked.
Griezmann accounted for three wayward efforts and did not hold back in his criticism of a blunt Barca performance.
"There was a lack of desire, of attitude. It was all wrong," he said. "A bad day, a bad game.
"The fault lies with the players - we are the ones who play. We have to work. We have to win on Sunday [against Levante] because it gets more complicated for us if not.
"Today has been very ugly. We have the level to fight for our objectives. This is a blow, but it comes in handy to wake us up."
Barca head coach Ronald Koeman added: "We started the game badly, without aggression. It seemed that we were playing not to lose. We were not in control.
"We have not been good defensively. We lost the game in the first half hour. I always try to prepare the game, how they have to go. We left spaces.
"You can also discuss penalties. For me, the first is not a penalty. But it was our fault."