Sports minister Richard Caborn says he has been assured that the new Wembley stadium will be completed on time.
Builders Multiplex have hit problems with the project but have told him they are confident work will be finished in time to host the 2006 FA Cup final.
Caborn said: "Multiplex founder and executive director John Roberts has guaranteed that the stadium will be on time at the end of January.
"It will be handed over then and be a stunning stadium by any standards."
There has been some uncertainty, with the Australian construction giant suffering some financial problems and expected to make a loss on the project.
But Caborn, in Singapore as part of London's 2012 Olympic bid, said: "There is no backlash from Multiplex's problems.
"It's a fixed-price contract so they have to take the hit on that but, in terms of quality and being on time, we are assured it will be there."
Wembley is due to host the Olympic football finals if London wins the right to host the 2012 Games.