The Red Devils had Robin van Persie to thank after the Netherlands international cancelled out Pantelis Kapetanos’ opener before adding a second after the break in Romania.
Rooney supplied both goals and admitted after the match that it had been a difficult evening for the Red Devils.
“It was obviously a nice goal, a nice finish by Robin and if players make runs I have more chance to pick them out,” he told ITV Sport.
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“Obviously it was a tough game, a very tough pitch, you have to make sure you are fully concentrated.”
However, the striker also warned that this team must improve their defending, after going behind yet again.
“It’s difficult in the Champions League and we know that and it was a silly goal to give away, thankfully we managed to get back in the game and win the game,” he added.
“A silly goal and we need to stop that.”
Rooney started the game alongside both Van Persie and Chicharito and also said he felt his side might have had more goals.
“It’s great to get the first 90 minutes in [after injury], I’ve been working hard and looking forward to getting a run in the team,” he said.
“We should have done more with the possession, sometimes in the Champions League, you need to take the heat out of the game, they put us under a bit of pressure at the end but we held on
“We’ve got a home game next, its important we get three points and then we’ll be in a great position in the group.”