Sir Alex Ferguson has given further reaction to the completion of the signing of Robin van Persie, claiming that the former Arsenal captain was “desperate” to join United.

“It wasn’t an easy one,” Ferguson told MUTV. “Understandably, Arsene Wenger didn’t want to sell to Manchester United – he’s already mentioned that in the morning papers. The boy wanted to come to us and that’s important. He turned down various clubs to join us because he wants the challenge of coming to the biggest club in the world. I think that’s fantastic. That’s what swung it and what made it possible. If he hadn’t come out forcibly to Arsenal to tell them he wanted to go to Manchester United, it meant the negotiations were really over – the only negotiation left was agreeing a fee with Arsenal as there was no-one else in the picture because the boy wanted it and was desperate to come to Manchester United.”

This now means United have Wayne Rooney, Van Persie, Chicharito and Danny Welbeck (assuming that Dimitar Berbatov will now leave) to choose from.

“It’s not going to be easy,” he stated. “I’ve brought a complication to my life now really. I think absolutely it had to be in my estimation for bringing Robin here [to combine him with Wayne Rooney]. We had to say: ‘What would be the combination?’. Robin can actually play in two or three positions as he has done at Arsenal. But last season proved what his best position was – No1, furthest up the pitch. 37 goals and 30 league goals – that itself tells you what his best position is. My situation now is I have the possibility that I can play Rooney through, van Persie through, Chicharito through and I’ve got Danny Welbeck, who can play through. I’ve also got Shinji Kagawa playing in that hole behind and he’s a fantastic, young footballer. That’s my dilemma and was also have young Federico Macheda, who is only 20 years old and still improving.”

Ferguson has reflected on how the deal came in to place, admitting that once the player confirmed he wanted to leave Arsenal, there was no way United couldn’t get involved.

“You can’t turn that down,” said Ferguson. “I didn’t think it was possible we could get van Persie when we talked about it last year but, when I heard he’d refused to sign a new contract and made it publicly known that he wanted to leave Arsenal, then we had to be interested – there’s no question about that. I spoke to David Gill and David spoke to the Glazer family and we got the ball rolling but that was some months ago. It’s been a long haul and it’s not been an easy one but, thankfully, we’ve got him here.”