The English side found themselves under the kosh in the first half, conceding twice to efforts from Juan Bernat and Neymar, but they went in at the break only one goal down.
Sadio Mane raced into the box with Angel Di Maria chasing him. The Argentine flew in with a strong challenge, and although it looked as if Mane went down early, the penalty was eventually given.
The referee had initially awarded a corner, before being overruled by his assistants and pointing to the spot. It was a decision not without its controversy, but you have to question what Di Maria was thinking.
Milner stepped up and stuck the ball in the bottom left corner. Gigi Bufon went the wrong way but was unlikely to get near it if he had guessed correctly.