At an EU referendum event, the Leave campaigner advocated an amnesty for illegal immigrants who have been in Britain for 12 years.
Mr Johnson also called for an Australian-style immigration points system would enable Britain to "take back control" of its immigration policy.
Voting to leave the EU would send a signal of discontent to the "people running the European Union", Michael Gove has said.
Speaking at an EU referendum campaign event, the leading Leave campaigner said Brexit would send the EU a message that Britain has solidarity with the "suffering" people of Greece, Spain and Portugal.
Mr Gove said leaving the EU would also send a message about a desire to end "the misery of the single currency" and to have "democracy restored across this great continent".
He added that youth unemployment and misery in Greece has created a "desperate situation in a wonderful country".
In a 2013 interview, Boris Johnson says he wants Britain to be able to 'trade freely with our European friends'.
The Mail on Sunday and the Observer come out for remain while the Sunday Times and Sunday Telegraph back a Brexit.
David Cameron and George Osborne have issued an impassioned appeal for a vote for Remain, warning that Brexit would be the "big mistake"