Premier League - Vidic targets opening day
The 30-year-old has been out since December because of damaged knee ligaments.
But he said in The Sun: "I can now run and do some things on the pitch which is better for me psychologically because for the last four months it's been every day in the gym, which is hard.
"But the worst part is behind me. I can look forward to the second half of the rehabilitation and work more on my fitness.
"Hopefully, I'll be fit for the big kick-off."