Contractors helping to build the new Wembley Stadium are to hold crucial talks to try to avoid workers being laid off.
Steelworkers, scaffolders and welders were told on Monday they would be sent home next week unless subcontractors were paid.
Union officials want meetings with managers following the talks, so that they can tell members what is happening.
Tom Kelly, national officer of the GMB union, said: “We need to be told by Thursday what is happening because we are seriously committed to finishing the Wembley project.
“We have instructed our members to carry on working normally until we have an opportunity to resolve the matter. The stadium is not finished and someone will have to employ our members to finish the job.”
Amicus has also told its members to continue working while the talks continue.