The match had finished 0-0 after extra time and Costa was the hero after becoming the first keeper to save three penalties and also not concede a goal in a Euros shootout.

"I think this was the game of my life," he told reporters. "Maybe the game where I was most useful. I am very, very happy and I am also very excited that I helped the team."

The man of the match tried to read the body language of the Slovenia penalty takers but in the end it was pure instinct. "What I thought, I need to stop this - and went with my gut."

Despite the match remaining goalless after 90 minutes, Cristiano Ronaldo had a chance to break the deadlock for Portugal from the penalty spot in the first half of extra time.

However, Slovenia goalkeeper Jan Oblak produced a spectacular save to deny the Portugal captain, leaving Ronaldo visibly emotional and in floods of tears.

"Cristiano is the hardest worker. I understand how frustrated he is, he devotes all his time to this", Costa said.

"We felt that we needed to keep believing. Everybody makes mistakes. But important is what we do after making these mistakes", he added.

Bernardo Silva struck the winning penalty in the shootout for Portugal who will meet France - 1-0 winners against Belgium earlier on Monday - in the quarter-finals in Hamburg on Friday.