Mourinho’s side currently languish in sixth place in the Premier League table after only managing one victory in their last five games.
Man United, following their 3-1 victory over Swansea at the weekend, sit eight points off the top and six off fourth spot.
However Zlatan, who ended an eight game goalless spell with a first-half brace on Sunday, is adamant that this United side will eventually click.
“We have a mix of ages – experienced players, young players, the quality is there,” he said. “I think we can achieve big things.
“I said after the Liverpool game and I said it before that we just need to find the ‘click’ where we find each other.
“Every day that goes by, the more you get to know each other and it becomes like a family. You know what you need – I know what I need to do to get the maximum out of my team-mates and the same thing on the other side, they know what they need to bring that out of me.
“The pieces are there, we just need to put the puzzle together.
“It will click. We just wait for the moment when everything is clicking among each other, not only inside the pitch, but outside it. I don’t say things are bad because things are good.
“We’ve been a little unlucky in certain games but we believe and, when you believe, it will come. I like to train hard, that’s my philosophy. If you train hard, you get what you want to get. Hard work pays back, according to me.”
The most frustrating thing about United under Mourinho is not how bad they’ve been, but – somewhat ironically – instead how good they’ve been.
This is a side capable of swashbuckling performances. A mixture of youthful exuberance and experience, deftness and aggression, control and ferocity. Mourinho’s first team squad is adorned with world-class talents, but United fans have only seen glimmers of what this side can achieve. There have been moments – very brief moments – where this side has clicked, and the results are emphatic: Leicester City, Fenerbahce, the first-half against Liverpool, amongst a few other games – small glimpses at what could be very special.
United fans will be desperate to see Mourinho carve out a set-up that allows for his men to maintain that level of rip-roaring potency in the coming months.