Tottenham Hotspur have been forced to delay the opening of their new stadium because of issues with critical safety systems.
The club had been due to hold its first match at the new ground against Liverpool on 15 September but that match has now been moved to Wembley.
Spurs said it is in urgent follow-up meetings with Mace and the other trade contractors at the stadium.
The club said in a statement:
We are reviewing the situation and planned timetable to rectify and re-test, after which we shall be in a better position to outline a revised timetable.
The delays created by these difficulties mean that we can no longer hold the necessary Test Events on 27 August and 1 September. These will need to be rescheduled to take place ahead of any first official match at the new stadium in order to achieve the safety licence.
In the meantime the upcoming Premier League matches against Liverpool (15 September) and Cardiff City (6 October) will be switched to Wembley, as will the NFL match scheduled for 14 October.
Chairman, Daniel Levy, added:
We know this will be disappointing for all our season tickets holders, premium members and our fans worldwide. We appreciate the support our partner the NFL has shown since the extent of this issue became evident today.
At the start of the project we asked for your support during what we knew would be a complex and challenging build and now we ask for your continued patience and forbearance.
Mark Waller, NFL executive vice-president, international, said:
Everyone has been so excited about the prospect of playing in the new Tottenham Hotspur Stadium and I know all at the Club are very disappointed, but determined to clear this final hurdle. We totally understand the issue.
We shall continue to work with them towards making our future games at Spurs a huge success. The new stadium will be an amazing venue for the NFL and we are very excited about our long-term partnership with Tottenham Hotspur.