Marcus Rashford says intensity was the key behind Manchester United's 2-1 win over PSG.
The Englishman proved the match-winner with his superb 87th minute striker separating the two teams.
And Rashford believes it was United's pressure on PSG which enabled them to claim the three points.
Speaking to BT Sport, Rashford said: "Of course it's a nice feeling. More importantly, we won the game. We're in a strong position now in the group but it's the first game. The concentration levels we showed today we have to take forward into the next game.
"For me, they were both opportunities to win the game. As a striker, in the game late on, that's the mentality. You might only get one chance. It gets us the three points.
"It's a good performance but also one where we have a lot to build on. I always believe in the tema. As players it's important to believe in the system that the manager chooses to play. We did that fantastically. It was tough but we kept the intensity high. We had to defend very deep at times. They have some amazing players. In the low block it can be tough but the guys on the sides - the full-backs - they defended unbelievable. When we defend like that man-to-man, we can do really well.
"Every game requires different tactics and a different performance but what has to stay the same is the intensity. The intensity was key for us tonight. We kept going for 90 minutes. We are very happy today."