The Blues want to spend 100m transforming a run down 80 acre plot near the ground but progress threatens to be stalled by Mr O'Brien's refusal to leave.
"However, it will not significantly impact on this ambitious regeneration scheme because it was always recognised that there is a possibility that a CPO might be necessary and ultimately the government will decide whether to grant the order based on what is in the public interest."
Businessman urges Manchester United fans to buy his land
Shaun O'Brien has set up a website, Unite Against City, offering square foot blocks of land at his vehicle recovery company near the Etihad Stadium.
The ambitious training complex plans include a 7,000 capacity arena, community facilities and a sixth form college.
"By Mr O'Brien's own admission on his website, there is absolutely no guarantee that anyone buying one of these plots of land would be able to recover their costs.
We understand that he was offered around 1m to go but has rejected the money. A compulsory purchase order to try to force him to sell at market value has now been issued.
On his website, Mr O'Brien says that his campaign is designed to 'prevent Manchester City's attempts to acquire our land in Eastlands, Manchester, in order to further their goals of football domination . . . and show City they can't bulldoze over everything in their path just because they have more money than anyone else'.
Mr O'Brien said: "I was taught that if somebody wants something of yours and will not negotiate reasonably and brings a big stick with them, you don't roll over. I am a Mancunian and fully support all that is being done in this area. What I am against is the methods used to carry out the plans.
Manchester City declined to comment.
Last October, we revealed Mr O'Brien's firm was one of just four in the area still to agree compensation packages to go. Dozens of other firms had already accepted.
A businessman who supports United is blocking City's plans to build a world beating training complex by selling his land to fellow Reds.
He describes his scheme as an investment opportunity, claiming City would have to negotiate individually for each plot. He acknowledges that buyers may not get back their full investment but says it is not a scam and he will transfer ownership through the Land Registry.
Town hall chiefs said all companies were offered 'reasonable sums' with packages believed to have included market value sums for land, relocation costs and compensation money.
on Score Street, Mantax on Corbett Street, and New Life Windows on Quinn Street.
He said the website was his way of 'fighting back' and revealed he had received hate mail and threats since it emerged he was refusing to sell.
A spokesman for Manchester council said: "Anyone buying land, even a small plot, should take independent legal advice and inspect the land before buying.
"The Unite Against City scheme is in no one's best interests, except Mr O'Brien's. The valuation he is placing on his land is far in excess of anything in Manchester and would make it equivalent to the most expensive plots in the most expensive areas of London.
said he had the 'moral high ground'.
A decision on the CPO is expected to be made by government before the end of the year.
"This land will be owned by them sooner or later I accept that. But as I have been here for 15 years, putting my blood, sweat and tears into it, should I just hand it over and let them take advantage of the recession and depressed property values?"
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But Mr O'Brien has launched a last ditch campaign calling on other United fans to support his 'David and Goliath' battle. He is offering plots of his land at OB Trucks, on Quinn Street, for 250 per square foot and says he hopes to sell a minimum of 5,000 plots, which would work out at 1.25m.
He tells United fans another reason to buy is to get 'payback' for the 6 1 derby defeat at Old Trafford this season.
Plans for the training complex were unveiled after years of research which saw City Nike Air Max 95 The Game chiefs visit more than 30 elite sports venues across the world. A public consultation exercise showed local people were overwhelmingly in favour.
Beswick born Mr O'Brien insisted he supported the regeneration plans but did not want to be forced out and Air Max Men White
Manchester City's 100m training campus plans
Backers say the project would create 250 jobs and kick start development in one of Britain's poorest neighbourhoods.
"We have made a CPO for this land. This would not have been necessary if Mr O'Brien had been prepared to sell it at a realistic price and accept the football club's offer of help to relocate his business.
It is understood that New Life Windows have also objected to the purchase but discussions are ongoing with cab firm Mantax and Tyre Save. Air Max In White
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