United's 4-1 win over West Ham at Old Trafford was illuminated by Mkhitaryan's touch and eye for a pass in only his third start for the club since his high-profile move from Borussia Dortmund in the offseason.
"We know the reason we brought him and we were waiting for his evolution and it looks like it's coming".
On Wednesday he showed he has still got it though, scoring twice in the second half to drag United out of their latest tricky spot and secure a 4-1 EFL Cup quarter-final victory over the Hammers.
The former Germany global, who has been linked with a move to Major League Soccer with Chicago Fire, was restored to first-team training recently and on Sunday was named on the bench for the first time - though he was unused in the 1-1 Premier League draw with the Hammers.
Southampton beat a largely second-string Arsenal team 2-0 in the other quarterfinal match to complete a lineup for the last four that also includes Liverpool and Hull, who were winners on Tuesday.
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Divock Origi scored five minutes earlier as Liverpool reached the semifinals of English soccer's second-tier cup competition for the fourth time in the last six years.
Mourinho added: "I'm so happy because he was against a Premier League team with Premier League qualities and Premier League characteristics".
Ashley Fletcher gave the visitor's hope 10 minutes before the break, pouncing on David De Gea's error to make the score 1-1. Moments later the fans were celebrating a second for Ibrahimovic in injury time to cap off a great evening.
Martial tucked away Mkhitaryan's cross to restore United's lead in the 48th, and scored a second goal in the 62nd after good interplay from Ibrahimovic and Antonio Valencia.