The Hoops have taken a little while to adjust to life under the Norwegian after he replaced Neil Lennon in the summer but Nigerian centre-back Ambrose feels recent results suggest things are starting to click at Parkhead.
"From the start it was a hard change because it's not been easy playing the way he wants us to play," said Ambrose in the wake of Thursday night's 1-0 Europa League win over Dinamo Zagreb.
"But hard work pays at the end, so we are working hard and I believe we will soon start to reap the reward of what he is trying to bring into Celtic.
"I think we are getting used to it and getting better. The level he wants us to play is very high but I feel in a few months we will be there. If you are not fit you cannot play at the level he wants us to play at.
"You know you can press but when it gets to 80, 90 minutes, it tells. But that is when you show the extra spirit and everything you have got to keep on fighting.
"We never give up. That is what he has brought into us. We will make sure we fight on for 90 minutes the way he wants us to play."
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