At this stage of the season with so few points (two) between the top two sides, the race for the title could be seen as simply a mental game but Mjallby believes it is more than that.
"I think it's a bit of both," said the Swede.
"The ability is always going to be important because of the way we play the game and the way we hope to make sure we pick up the three points.
"Mentality-wise, I think there are too many games to go before you can start to think about getting nervous about things.
"Especially now, with so many games coming up, it's just important for us to get as many wins as possible.
"When it comes to the latter stage of the season, it might come in handy if you are very strong mentally then."
But Mjallby insisted that the green and whites are only worried about the things they can control in their camp and will be striving to win every game they step out for.
"It's always good to be top, that's what we are aiming for. Rangers won yesterday and they put a wee bit of pressure on us to try and get three points," he added.
"We did that with a good performance. The pressure is always going to be there and there are a lot of important games coming up.
"We just need to focus on ourselves and make sure we win as many games as possible and get a good run now. When we play them next time, that's the first time we are going to worry about Rangers."