Berbatov joined United from Spurs in a £30.75million last year, but attracted criticism for his performance last season.
“I wouldn’t agree with those who said he [Berbatov] had a dreadful season,” Rooney explained to Sky Sports.
“He won the Premier League and reached the Champions League final, and fully played his part in those successes.
“He still got criticised but he’s a class act and has come back with a real desire about him this year.”
