"There will be no repeat of the 7-1," he said.
"As long as we get the three points, I will be happy."
The England international added: "We are obviously one of the key teams in the Champions League but we can't think about winning it right now.
"At the moment, we are in the same position as everyone else.
"It is only September, so the final is a long way off yet. The aim is to reach our peak later in the season. Hopefully we will get into the latter stages and then get the breaks any team needs to progress beyond that.
"I have had a lot of experience at Bayern Munich and been successful in the Champions League, so I am very excited about playing in this competition with United.
"I have heard the European nights at Old Trafford are very special, so I am looking forward to that. The atmosphere against Chelsea last week was exceptional and I look forward to a similar atmosphere, if not better, against Roma."