The Ibrox club rode their luck at times after James Tavernier’s 19th-minute penalty broke the deadlock.
Jackson Muleka twice headed against the bar in the first half and Standard pushed for a leveller after the break.
But Gerrard’s men held firm in front of more than 3,000 fans in Belgium.
Poland’s Lech Poznan travel to Glasgow next Thursday for the second game in the section, having started their campaign with a 4-2 home defeat by Benfica.
- Rangers earned their second away win in 11 attempts in the Europa League (D5 L4).
- This was Standard’s first home defeat in Europe in 15 games since in December 2014.
- Since their last defeat in August against Bayer Leverkusen, Rangers have won 12 and drawn two.
- Tavernier is Rangers’ top scorer in all competitions this season with nine goals.
- Roofe has scored three goals in his last five games.