Cape Town - Ashley Young was delighted to make an impact as a half-time substitute as the Red Devils downed old foes Liverpool on Saturday.
After a dull, goalless first half, Young was sent on to replace the ineffective Memphis on the wing for United.
Young's impact was felt immediately as the England winger was fouled, setting up the set piece which saw Daley Blind smash home the opening goal.
The 30-year-old winger revealed he was sent on with little instruction.
"The boss told me I was coming on at the break. He didn’t give me too many instructions but I knew what I had to do. " Young told the Manchester United website.
"As a winger you want to get the ball and run at the full-back, get crosses in the box and create chances. And when you’ve got Felli [Marouane Fellaini] in the team, pulling off at the back post, you can put the ball there and know he’s going to win it.
"It was tough in the first half. Liverpool sat behind the ball for a lot of the game. We had a lot of possession but we knew we had to come out in the second half and create more chances. After getting the first goal as quickly as we did, we were always on the front foot and didn’t look back.
"We’re delighted to get the three points and bounce back from the defeat against Swansea, and there’s no better feeling than to do it against our rivals at Old Trafford."
Manchester United's 3-1 win lifted the club to third on the Premier League table, five points behind Manchester rivals, City.