Sir Alex Ferguson expects Manchester United to improve in the Champions League after accusing his players of "reckless football" in their last 16 victory over Internazionale.
United won their second leg 2-0 at Old Trafford to progress to the quarter-finals by the same aggregate scoreline.
Headers at the beginning of each half from Nemanja Vidic and Cristiano Ronaldo secured the victory over the Italian champions.
But after riding their luck on a couple of occasions and allowing Inter to gain a foothold in the game either side of half-time, Ferguson was critical of his side's display.
"After scoring the first goal, I thought we would go and kill them off," he said.
"I thought we could score a few goals but then we started doing flicks and back heels, hitting balls into space where no-one was.
"We can play better than that but I am happy to get through it.
"It was really reckless football and it allowed Inter Milan to get a grip of the game.
"From the middle of the first half to the end of the first half they were the better team.
"We changed the system at half-time, closed the door on (Esteban) Cambiasso and we were a bit better in the second half.
"We played a team at its maximum - potential-wise with all the experience they have - and they played to their maximum.
"We can play better than that and I am sure we will be better in the next round."