Tottenham are into the Carabao Cup final after a 2-0 win against Brentford on Tuesday night.
Spurs have not claimed silverware since they beat Chelsea in the 2008 League Cup final and they were made to work hard before seeing off the Championship promotion chasers in this one-leg semi-final at Tottenham Hotspur Stadium.
Brentford had beaten four Premier League sides in the run to their first major semi-final but they were behind after only 12 minutes when Moussa Sissoko headed Sergio Reguilon's cross beyond Bees' keeper David Raya.
Thomas Frank's side thought they had equalised after the hour when top scorer Ivan Toney headed in but the goal was ruled out for the most marginal of offsides when the striker was actually down on his haunches earlier in the move.
Spurs increased Brentford's sense of injustice when Son Heung-min raced clear to add a second after 70 minutes before the visitors were reduced to 10 men following Josh Dasilva's foul on Pierre-Emile Hojbjerg.
Mourinho's side will now meet either Manchester United or Manchester City the final at Wembley in April.
Afterwards, Spurs defender Eric Dier said: "We're really happy to be in the final after a really difficult game against a very good side, Brentford are just as good as a lot of teams in the Premier League.
"Every game is difficult, credit to Brentford they were very well organised. We knew if we were right in our approach we had the mentality to win.
"I felt it was offside straight away but I didn't know how close it was. If the technology was right then there's nothing to complain about really.
"We are trying to compete in every competition. This was our first chance to reach a final and we have taken it."
