Herzog and de Meuron's proposal for Portsmouth Football Club's new stadium has stalled after the council hit the firm with a list of planning concerns.
The Swiss practice will have to overcome a staggering 40 hurdles to be in with a chance of realising the £600 million scheme, which was unveiled in April.
It is unclear exactly what the issues are, but it is thought they could delay the planning application, expected to be submitted in the autumn.
Speaking to The News
in Portsmouth, council leader Gerald Vernon-Jackson said the list was simply to help both the architects and the club when they submit the application.
He said: 'We are trying to be as helpful as possible to the football club. It's such a big planning application and they've chosen the most difficult place in the city to build, so we are putting ourselves out to give every assistance we can.'
The new stadium will hold 36,000 fans and will also deliver 1,500 flats. The club's existing ground, Fratton Park, will be bulldozed and replaced by hundreds of new homes.
The massive scheme is adjacent to HGP Architects' Spinnaker Tower and located on reclaimed land called The Hard. The proposals include providing the city with a new train station, which will be capable of transferring fans directly to the ground.
Portsmouth FC has insisted the ambitious plans will stay on track and the team will be playing in the stadium by 2011.by Richard Vaughan