Ten Hag said: "We did our job. We are prepared so we know their team, know how they play, know the individual abilities of the players and know the manager. He is a former United player, a striker, he's doing a fantastic job over there so we know a lot about them.
"Of course they are dangerous, they are in the semi-final, then it's logical. Last season they were not far away from promotion to the Premier League so they're doing a fantastic job over there. We have seen the game against Wolves in the quarter-final, the mentality is fabulous. We have to play to our best levels."
On whether winning the Cup would rescue their season, Ten Hag said: "You have to always see the circumstances we have to face, but I'm not thinking in this moment about this. I'm thinking about Sunday, about how we go to beat Coventry City. It's all about this and the rest is for later. We are planning for next season but for now it's all about Sunday.
"Last season was last season. We want to achieve every season, we want to win trophies, we have a big opportunity because we are in a semi-final but it's a huge challenge. We know all the problems and always when you have so many problems you have to find solutions, so on Sunday we will find solutions and we want to go into the final."