Christians Ronaldo near 700 career goals after scoring against Luxembourg
Manchester City’s Bernardo Silva opened the scoring before Ronaldo scored with a chip over Anthony Moris.
Valencia’s Goncalo Guedes completed the scoring just before full-time.
Portugal remain second in Group B, five points behind Ukraine, but four points clear of Serbia in third.
Ronaldo will have the chance to become just the sixth person to score 700 goals when Portugal travel to Ukraine on Monday.
Fernando Santos’ side can qualify with a win in Kiev, if Serbia fail to win in Lithuania.