European Union leaders have warned that the UK must honour the principle of free movement of people if it wants to retain access to the single market after it leaves the bloc.
European Council President Donald Tusk said the UK could not pick and choose.
The French and German leaders also made clear that the freedom of movement of people was non-negotiable.
The leaders were speaking after a summit in Brussels without the UK, the first for more than 40 years.
European Commission President Jean-Claude Juncker again said that there would be no discussions whatsoever with representatives of the UK on a possible post-Brexit relationship until the UK has formally notified the EU of its intention to leave by invoking Article 50 of the Lisbon Treaty.