Rangers legend Barry Ferguson reckons that Sunday's Old Firm is the biggest game of the season for his old side.
Giovanni van Bronckhorst's men face Celtic at Hampden in the Scottish Cup semi-final this Easter Sunday.
The clash means that the Glasgow rivals meet for the second time in as many weeks.
But before Rangers can focus on Sunday's game, they have a Europa League quarter-final second leg against Braga to get through.
The Gers will be looking to hit back after a 1-0 defeat in Portugal last week with a semi lying in wait against the winners of RB Leipzig vs Atalanta.
Hoping to take some momentum from Sunday's 4-0 win at St Mirren, Rangers will be hoping this week goes as well as it possibly can, securing their place in the next stage of both the Scottish Cup and Europa League.
But getting revenge on their Glasgow rivals on Sunday is the most important, according to Barry Ferguson.
Speaking on the Go Radio Football Show, Ferguson said: "In terms of the title at this moment in time, it's going to be so difficult for Rangers.
"Five games to go, six points behind.
"What Rangers need to do is concentrate on each game as it comes, Europa League on Thursday, Scottish Cup on Sunday against Celtic, just winning games of football and hope that Celtic at some stage falter.
"But if I'm being brutally honest, I can't see that happening with the sort of form Celtic are in.
"I want Rangers to beat both Braga and Celtic, of course.
"Come Sunday, I don't know how to put it. It's massive, absolutely massive that they try and make sure they're in that cup final against Hearts or Hibs.
"But it's going to be tough, you just see the form Celtic are in, they're relentless.
"But Rangers need to throw everything at Braga and Celtic.
"Can they win the Europa League? It's going to be hard, getting to the semis would be an amazing achievement.
"Then the focus goes on to Sunday, which for me, is the biggest game of the season."
