Buttner made the sixth appearance of his Old Trafford career last night, suffering his third defeat on the trot after previous reverses at Chelsea in the Capital One Cup and Galatasaray in the Champions League.
Not that the 23-year-old is too concerned, believing he did well against Cluj last night.
"I played a good game," he said.
"I put a lot of crosses in but we have to score more goals.
"But we all know the important game is the next one - City away - we have to focus on that now."