McKinnon’s Terrors sailed past Ton with a second-half blitz during the 3-0 second-leg victory and the United boss reckons his team can go into the Bairns clash with confidence.
He said: “Morton are a good side so it was a tricky tie and the icing on the cake was the overall performance from the lads.
“It’s another quick turnaround for Falkirk on Tuesday.
“They’ve done well again this season. But we’re at home and we’re in form again so we’re looking forward to it.
“We’ve got momentum which is important so we’ll see where it takes us.
“We could have won our last six or seven games but the important thing is we’re playing well and the lads look fresh and lively.”
The 46-year-old gaffer took time to praise midfielder Wato Kuate for notching a terrific strike from no less than 30 yards against Morton to help kill off the tie.
He added: “I had a chat with Wato at half-time to tell him to buck up his ideas and he responded with a wonderful strike.
“It was probably a strike Tannadice hasn’t seen in a long time.”