The Red Devils striker says he has played less games than he is used to due to injuries and Sir Alex Ferguson's rotation policy and believes he has much more to give
Rooney scored as United beat Norwich to extend their lead to 15 points at the top of the table on Saturday, with rivals Manchester City due to play on Monday night.
Sir Alex Ferguson's team will now face Real Madrid for a place in the Champions League quarter-finals on Tuesday and Rooney says his occasional injuries, coupled with his manager's rotation policy, have left him with plenty more to give.
"I haven't played as many games as I normally would have at this point in the season," Rooney told reporters. "I feel fresh and ready for that battle until the end of the campaign.
"It's been a bit of a stop-start season for me with a couple of injuries, which has been a bit disappointing.
"I just want to keep myself fit until the end of the season now and play a part in as many games as I can to help the team be successful.
"With the way the manager rotates the team, there will be a lot of players who are feeling fresh as well.
"We know Real Madrid is a massive game but this [Norwich] was just as big. We weren't thinking about Tuesday but, now it's over and we've got the three points, we can focus on Madrid."
United conceded the title to City in dramatic style last season but Rooney believes that silverware in 2012-13 could set the tone for the current squad to achieve further success in the years to come.
"This is a brilliant squad with a fantastic mix of experienced players and young players who all have great ability and a real desire to win," he added.
"Being successful this season is really important because it would give us a great platform to kick on in the next few years.
"Once the young players have got their first taste of silverware with the club, they'll realise just how good it feels. They'll want to keep doing it again and again."