FC Copenhagen took matters into their own hands within the first 30 minutes as they secured a two-goal lead early on, which allowed them to sit back and control the match for the remainder of the tie without putting in too much effort.
The match started at an increased pace, and Vejle nearly got off to a dream start when FC Copenhagen defender Rodrigo Huescas allowed the visitors to steal the ball within the FC Copenhagen box, but Mikkel Duelund failed to keep his composure as his close-range finish went over the bar.
A minute later, the home team launched an attack with enormous intensity, and Thomas Delaney tackled the ball into the path of midfielder Lukas Lerager, who, from the edge of the box, rifled the ball into the top left-hand corner to open the score.
Soon after, the home side were also awarded a penalty kick, but after a VAR review, the referee decided to cancel it.
Vejle should be praised for not throwing in the towel and enjoyed a lot of possession, but despite promising build-up, they failed to create any clear-cut scoring opportunities that would have allowed them back into the game.
And instead of Vejle restoring parity, the home side doubled the lead after 25 minutes, when Jordan Larsson was allowed to turn into the Vejle box to curl an unstoppable shot into the left-hand corner without any chance for Vejle keeper Igor Vekic.
In the second half, the home side seemed content to defend without allowing the visitors back into the game to save energy for their upcoming Champions League qualifier on Thursday in Kosovo against Drita, where they have a comfortable 2-0 lead to defend.