Gordon Strachan has told his Celtic players they will have to stay mentally and physically strong if they are to lift the SPL title.
Celtic have a three-point lead at the top of the table and will be looking to pick up another victory at home to Falkirk on Wednesday evening.
But Strachan knows it will still require a great effort if Celtic are to hold on and clinch a third successive crown.
"It takes everything," he insisted. "You are tested everywhere - mentally, physically, technically.
"You never know when you need that certain character or more ability.
"When it comes along you will know it and you will find out if you have enough. It might just come instantly, it might build up."
Celtic overturned a seven-point deficit in April and May last year and striker Scott McDonald expects another tight finish.
He believes Rangers will keep putting pressure on until the final day of the campaign but is confident Celtic can emerge triumphant.
Asked what would be needed to win the title, McDonald answered: "The most consistency really, it's as simple as that.
"There is no doubt the last Old Firm game is going to be huge.
"But on saying that, that's getting ahead of ourselves. It's about winning every game that you can possibly win and that starts tonight."
The 25-year-old added: "It's hard to question which team has got the bigger bottle. Both teams have done very well in the last couple of years when they have been in the Champions League, and Rangers got to the Uefa Cup final.
"They will feel hard done by last year but we kept going as well and proved we could do that under pressure.
"I think they have done the same at times. I think it's going to come right down to the edge and may the best team win."