Christian Pulisic scored two goals as the Saints beat Manchester City to advance to the Champions League quarter-finals on Saturday.
The Polish striker, 21, was playing for Borussia Dortmund, a side that had won two consecutive European titles, when his goal came after Christian Pulissic had been fouled by Sergio Aguero.
It was a goal that, according to a BBC Sport analysis, made him a “legend”.
“When he scored, I knew we were going to win it,” said Manchester City boss Manuel Pellegrini.
“He has been a fantastic player for us.
He is a player that we are really proud of.”
That goal was very special because I think the goal itself, the way it came out, it’s something special.
I remember when I played in the first game, I was really happy that we scored.
“Pulisic has scored five goals in nine games this season and was a key part of City’s Champions League campaign.”
Pellegrinis side have won all four of their Champions League games this year, beating Inter Milan in the last 16.”
I’ve said before that we don’t want to score too many goals, but we do need a few more, especially for our strikers to score goals.”
Pellegrinis side have won all four of their Champions League games this year, beating Inter Milan in the last 16.
City were already favourites to qualify for the next round after winning the Premier League title in June.
But their hopes of repeating the feat have been dashed by the return of Aguero, who has now scored seven goals in his last nine games.
“I’ve never seen anything like this before,” Pelham said.
“When you play a team like Manchester City, they are a team that always have to score.
They are always looking to score, so I thought it was a great goal.
It was special.”
Pelfrey scored the equaliser for the visitors when he drilled a low shot into the top corner from the edge of the area after Sergio Aguerra had fouled him in the area.
But Pellegri was not done with his celebration as he made his way out to celebrate the win with his team-mates.
He made a point of telling Pellegris that the striker would be “in a very special position” on the pitch on Saturday, with the club’s fans expected to celebrate alongside him.
“In this position, I think I will have a really good opportunity to celebrate,” Pelas said.