Manchester City and Manchester United replica shirts have been banned from being worn by workers on the Etihad Campus, the Blues new £100m-plus training complex, to "stop it getting silly" due to rivalries between builders who may support the opposing clubs.

BAM, the company constructing the academy, stated that shirts of any teams are not allowed due to the "partisan" nature of football. A spokesman Mark Flattery, said: "They [BAM] just took a decision to put a blanket ban to address all of that and to stop it getting silly. We have just taken a very sensible decision to manage the site that way."

City plan to move into the campus before the start of the 2014-15 season and, though any United fans working on the site may be tempted to bury in its foundations memorabilia of the 20-times champions, BAM denied they are conducting spot-checks to guard against this.

Ian Fleming, an executive, told the MEN: "Strict building regulations are laid down for elements of the construction process one of which is for a local building control officer to inspect the quality of a structural concrete pour which includes checking the foundations."