Mourinho will be looking to hoist the League Cup for the fifth time with three different clubs, but he insists it is too early to talk about winning it.
The North Londoners booked their place in the last four of the competition with a stellar performance at the bet365 Stadium and will now face Championship side Brentford.
Gareth Bale broke the deadlock inside 22 minutes but the hosts responded eight minutes after the break through Jordan Thompson.
Ben Davies restored the visitors’ advantage on the 70th minute mark before Harry Kane settled the Potters defeat nine minutes before the final whistle with a sumptuous goal.
"It's a trophy so when a team wins it it's always positive but it's too early to talk about winning it,” Mourinho said after his side’s victory over
Michael O'Neill’s men
The former Manchester United and Chelsea man added: "I would never pick a player I don't believe can perform for the team. It is an opportunity and of course our objective is to win."
Mourinho was further asked about the away changing facilities, which he previously criticized.
He said "It's very good. I know the ones that complained had reason to complain. Today very, very good facilities."
Spurs will now turn their attention to the Premier League as they try to atone for their sins after a back-to-back defeats against Liverpool and Leicester City.