The Gers will take on promotion rivals Hibernian at Ibrox in Glasgow in the Scottish Championship this afternoon.
“Rangers have got to stand up and be counted, this is the big one and the one that will tell the supporters and the manager what they are made of,” Rangers legend Johnstone, who played for the club in the 1970s and 1980s, has written in The Glasgow Evening Times.
“Do they have the heart, the bottle, call it what you like, to go out and beat Hibs and put on a performance?
“We haven’t played consistently well over 90 minutes for a while now but everyone will have to be at their best on Monday. If we can win, it is all but a four-point lead when you consider the goal difference advantage.
Rangers are at the top of the Scottish Championship table at the moment with 41 points from 17 matches. Hibernian are level on points with the Glasgow giants, but they are second due to an inferior goal difference.
Mark Warburton’s side will head into the game against Hibs on the back of a 2-1 defeat to Falkirk away from home at the Falkirk Stadium. It followed a disappointing 2-2 draw with Greenock Morton at Ibrox in Glasgow.
Hibernian will head into Monday afternoon’s match on the back of a 1-0 victory over Queen of the South. Alan Stubbs’s side are in good form at the moment and could pick up all three points from the encounter in Glasgow.