Manchester United boss David Moyes has admitted he was always going to find it difficult in replacing Sir Alex Ferguson.
Moyes' side have got off to an average start by Manchester United's high standards - as they have picked up just seven points from a possible 15 in their first five Premier League games.
Moyes would have been particularly disappointed with his side's dreadful display against arch-rivals Manchester City on Sunday.
However Moyes believes his new side were always going to struggle during the first few months of his Old Trafford tenure.
Speaking before United's Capital One Cup clash against Liverpool, Moyes said: "I don't think it was ever going to be the case this was going to be easy and smooth after Sir Alex.
"There were always going to be days like this and there might well be more days like this. I hope not, but there will be because that is football.
"It was always going to be tough following such a great manager with a great team and I think people with real football knowledge will know there are probably some changes to be made.
"It is not going to be made in one fell swoop. It is going to be done in time.
"That is why the Manchester United board realised the job that needed to be done was a long-term one."
Moyes wants his players to respond to their heavy defeat at the Etihad Stadium by recording a victory over north-west rivals Liverpool at Old Trafford on Wednesday.
"I think any game after you've had a defeat, you want to get back," added Moyes.
"[Liverpool] is an important game for us - we want to do well in all the cup competitions and that's what we'll try to do."
Moyes is likely to ring the changes for Wednesday night's game as he looks to freshen up his team for the Capital One Cup encounter.