The German had already been booked when the striker went down under a challenge from the midfielder in the closing stages of the Champions League quarter-final first leg, with referee Carlos Velasco Carballo dismissing the Bayern man with a second yellow card.
But, with replays suggesting that minimal contact was made in the tackle, Rooney claims that he was attempting to avoid possible injury.
|MAN UNITED LATEST
|6/1||Man Utd ar 6/1 with bet365 to reach the Champions League semi-finals|
"It's not nice to see anyone sent off and I didn't try to get him sent off. The referee has made a decision. I've tried to stop myself getting hurt and the referee has had a decision to make."
United now travel to the Allianz Arena needing to score at least once following Bayern's away goal at Old Trafford but Rooney is confident after a performance on Tuesday which he feels deserved the second-leg advantage.
He continued: "They are favourites for the tournament and it will be a tough ask but we needed to give ourselves a chance and we have done that.
"We have to go and score and [we are] disappointed to have conceded but we defended really well as a team and probably had the better chances and [are] probably disappointed we didn't win.
"They play a high line and, with a little more composure, we can exploit that. We have to focus and make sure we put everything into it. It's a massive game for our season so we have to make sure we are ready.
"It's a fantastic stadium to play in, to go there with the chance to knock them out, with them being the holders of the competition, it's a massive incentive for us and we are looking forward to it.