By ESPNSTAR.com staff
The former Newcastle youth player signed for Liverpool in January 2011, after impressing then Reds manager Kenny Daglish with the goals he scored to keep the Magpies in the Premier League.
Despite Dalglish's hopes for him, Carroll failed to establish himself as a consistent goal-scorer for Liverpool was promptly shipped out on-loan to West Ham by current boss Brendan Rodgers.
Ferguson told the Daily Mail that he was hardly surprised by Carroll's disappointing spell at Anfield, as he did not consider the Englishman good enough to play for one of Manchester United's fiercest rivals.
"I think it's up to the boy to improve himself, I think he only played something like a dozen games for Newcastle and then he had to deal with a 35 million pound transfer to a club like Liverpool when he's young. It's quite a big jump for him you know," Ferguson said.
"I'd certainly not sign that kind of player for that kind of money. We've gambled on young players in the past, maybe a couple of million or whatever, but when you get to that level, 35 million pounds, you really have to do a bit more homework and see how he is in his second season maybe."
Nevertheless, with Carroll recently getting off the mark for the Hammers in the club's 3-1 loss to Tottenham, the Red Devils manager conceded that he would be wary of the 23-year old's physical qualities when his team take on Sam Allardyce's men.
"It's not a lot of games that he's had. He's a big lad, a great header of the ball, aggressive and is a big bugger. You know he'll be a handful for defenders for us on Wednesday," Ferguson stated.