While he produced a vital last-minute winner to sink Fulham in March, Manucho struggled to win over fans during City's fight against the drop.
The 26-year-old has since returned to Old Trafford where he has another 18 months remaining on his contract.
Brown, who has stated his intentions to recruit two strikers this summer, says any move for Manucho would hinge on United's valuation.
He told the Hull Daily Mail: "There's mileage in Manucho but how much there is would depend on how much he would cost us.
"He's 6ft 4ins, he's got an eye for goal, he's got pace and he's got an awareness in the penalty box.
"There's certainly potential where he's concerned, but he's a very raw talent."