United will face Newcastle in the showpiece on February 26 after they beat Nottingham Forest 2-0 in the semi-final second leg at Old Trafford to seal a 5-0 aggregate win.
The foundations were laid with a 3-0 triumph at the City Ground in last week's first leg and quickfire goals in the second half from Anthony Martial and Fred rubber-stamped their trip to the capital.
It is their first domestic final since 2018, when they lost the FA Cup, and puts them one win away from ending a six-year trophy drought, going back to the 2017 Europa League success under Jose Mourinho.
Ten Hag knows it is not job done, saying: "It's good to reach the final, but it's not about reaching the final, it's about winning it that's going to be tough, a great opponent.
"Now the focus is on the Premier League, in two days it will continue. It has to give the motivation in the first place, we want to bring that cup to the fans.
"But in this moment I'm not looking ahead, we're focusing on other things, a big week is coming up, we have Crystal Palace and then two games against Leeds and they are going to be great games, derby games that we are looking forward to."
READ MORE: Carabao Cup: Manchester United set up Wembley final with Newcastle after breezing past Forest