By MARTIN BLACKBURN
Manchester United had already qualified for the last 16 but lost to minnows Cluj ahead of Sunday’s derby at neighbours City.
Boss Ferguson said: “Now the experienced players have to get their act together — as simple as that.
“We qualified early in Europe. After that we experimented and gave some young players a bit of experience.”
United head to the Etihad after only a second defeat in 37 home Champions League games.
The Red Devils were already assured of topping Group H before going down to the Romanians.
Luis Alberto’s 30-yard stunner won the game but United looked uncertain defensively again.
Fergie made 10 changes to the side that beat Reading 4-3 on Saturday.
He added: “They did the job quite well. We were beaten by a wonder goal but their commitment and composure was good and they’re still young.
“We didn’t deserve that goal. We had a lot of good chances and to lose a goal like that, you can have no complaints about that.
“Unfortunately, Tom Cleverley has got a calf injury, we’ll have to see what he’s like.
“And the positive thing is that we were able to rest players ahead of Sunday.”
Fergie’s men clinched top spot after winning their first four matches but could still be handed a tough draw.
Former Old Trafford favourite Cristiano Ronaldo and his Real Madrid team are among the possible opponents.
Fergie said: “We qualified comfortably, there’s no question about that.
“The real tournament starts at the end of February, the knockout stage is fantastic.”
