Cristiano Ronaldo converted a penalty kick in Wednesday's 3-1 win over Paris Saint-Germain with what was effectively a volley.

Ronaldo disturbed the turf under the ball, which made it move up to create a volley effect.

Rio Ferdinand, speaking in his role as a pundit for BT Sport, said: "He used to do that in training, you know.

"He used to mess about in training and do it but to do it in a game. I'm not saying he means it but he used to do it, I swear to you.

"Crazy, but he used to do it."

Former Premier League referee Graham Poll told the Daily Mail: "You cannot blame the officials for missing it, as it would have been almost impossible to spot in real time.

"But with the benefit of slow-motion replays, we can see that the ball bobbled up as Ronaldo planted his left foot before slamming it home with his right."