The Brazilian midfielder was there to fashion a backheel finish from Erik Lamela’s cross as the match ticked into the 93rd minute at Cardiff City Stadium.
The dramatic finale secured a 1-0 win in the Premier League and triggered joyous celebrations both from players and the fans who had made the trip to Wales.
It was no less than the team deserved after hitting 29 efforts at goal - 20 on target - only to be denied time after time by inspired home goalkeeper David Marshall.
“I’m delighted because we played so well and it was important to get the three points,” he said.
“It’s my first goal in the Premier League and I want to say thanks to everyone. I’m so happy.
“When I scored I went to the fans because our fans are the best.
“I feel very good, a little tired but very happy!”