The Red Devils agreed to cash in on their Argentine flop by agreeing a £15 million deal with mega-rich Chelsea for the former Lazio star.
Ferguson told MUTV he felt he was well covered in the midfield department, despite losing England captain David Beckham to Real Madrid, and still awaiting the decision on World Cup winner Kleberson's work permit.
Despite Veron not living up to his enormous £28.1 million price-tag, Old Trafford fans will be questioning their club after seeing a second world class star leave, and the club failing to lure a big-name replacement to the Theatre of Dreams after missing out on long-time target Ronaldinho.
"It's always difficult to let good players go," confessed Ferguson. "When the first opportunity concerning Juan Sebastian Veron and Chelsea came up I initiated the interest in Kleberson because I felt Kleberson was one for the future and in the long term was good for Manchester United.
"The initial response from Chelsea was that they didn't come back and we carried on with the Kleberson deal.
"The situation was we had a choice of central midfield players and then when another offer came in for Seba we decided to take it.
"I think there would have been problems ahead with the players in midfield.
"The overall package in terms of what we save on his salary and what we get from Chelsea made it difficult to turn down.
"It was more to do with the number of midfield players we had. We are very, very well off in that department."
With the money generated from the South American's sale, Ferguson may step up his efforts to lure another defender to the Premiership champions with Barcelona's Carles Puyol reported to be high on his wish-list.
The departure of two of the mainstays in the United midfield also means the former Aberdeen manager will continue to use Ole Gunnar Solskjaer on the right side of midfield.
"Solskjaer will play wide right as he did in every big game last season," said Ferguson. "He has adapted to playing out there because he is one of the most intelligent players in the game.
"He's a student. He reads the game and he's at an age when he has grown strong, his development as a footballer is exciting."
