The Red Devils captain started his first game alongside Rio Ferdinand in Sir Alex Ferguson’s defence since the pair returned from injury in a dramatic match against Southampton on Sunday.
The 19-time English champions secured an edgy 3-2 victory at St Mary’s, and Vidić revealed his displeasure at conceding two goals to the newly-promoted side.
“It was a difficult game and we conceded two goals we’re not happy with at all,” Vidić told United’s website.
“We’ve been told before the game what Southampton’s strengths are, what their game is and what they’re trying to achieve. In the end, they did it so it’s disappointing.
“I think it’s only the second time in a year myself and Rio have played together so it’s a long time and obviously it’s tough as everyone needs more games.
“I have to say, we are not really pleased with the goals we’ve conceded. There was a lack of concentration, I think, for all four goals we lost [in the last two games] but we have to work on it.
“You have to say we’ve had a lot of turbulence in defence with so many changes and people going in and going out.
“We didn’t have a constant back four and sometimes it causes a problem, but we look forward to the next games.
“We have over a week to improve our fitness and obviously our form so we are going to be right for the next game in the Premier League.”
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news