The Foxes booked their place in the fifth round of English football’s grandest knockout competition over the weekend with a dramatic 2-1 victory at White Hart Lane.
That win in the capital will have helped to lift morale, with Nigel Pearson’s side suffering only one defeat in their last six outings.
Ulloa believes that bodes well, while Leicester’s Argentine frontman was delighted to be back among the goals against Spurs.
He is, however, aware that Saturday’s trip to Old Trafford means more to the club in the long run, with Pearson looking to guide his troops off the foot of the table and bridge the three-point gap which currently separates them from safety.
Ulloa told the Leicester Mercury: "It was very positive for me and the team. It was a good result for us. We can enjoy it but, after that, we have to think about the next game because that's more important for us.
"I think Manchester United is more important than the the FA Cup because we are at the bottom now and we have to move up. But (the Tottenham) game is important because it gives us confidence for the rest of the season."
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Leicester know what it takes to topple the Red Devils, having secured a memorable 5-3 victory over Louis van Gaal’s side at the King Power Stadium earlier in the season.
Ulloa netted twice that day and now has nine goals in all competitions.
He will have a vital role to play over the remainder of the campaign, with it up to him and new arrival Andrej Kramaric to provide the firepower that will help to steer the Foxes clear of relegation danger.