United go to Sunderland tomorrow sitting in the bottom half of the table.
"We have to accept it has not been a great start," said Vidic.
"We have not been getting the performances we would have liked and we also have to be realistic enough to accept we have made some mistakes.
"This team has a lot of potential and we are working really well.
"Sometimes the results don't come. Sometimes the performances don't come. But I am really positive.
"The most important thing is to defend right. If we defend well, I think we have a really good chance to win trophies."
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