Can they deliver a complete performance?
You could be forgiven for thinking you were watching two different Rangers teams in the first and second halves at Ibrox last Sunday against Celtic.
In a blistering opening 45 they scored two goals, including an outstanding bicycle kick from Youssef Chermiti, had seven shots (two on target), and created three big chances.
To put that into perspective, Celtic had just one shot, didn't create a single big chance and only had six touches in the Rangers box (the hosts had 21 in the Celtic box).
Speaking at his media conference on Friday looking ahead to this weekend's Old Firm quarter-final, Rangers head coach Danny Rohl said: "The first 50 minutes was really, really outstanding.
"I really enjoyed being on the touchline in such a game.I think the biggest challenge in this game was that we felt after 50 minutes we could celebrate the win.
"You felt this in the stadium, in the stands. Everyone was convinced there is just one winner in this game."
In the second half it was a different story. Celtic had almost 60% possession, played 244 passes compared to Rangers' 180 and attempted 16 shots (Rangers had five). Crucially, the visitors scored two goals to take a point back to Parkhead.
"Everyone who knows football and who is part of this football knows games can change quick and a 2-0 is always dangerous," Rohl added.
"We did some things we probably shouldn't do again. I take the responsibility for the first half and I also take the responsibility for the second half because this is my job."
A frustration among Rangers fans has been the team's tendency to only perform in fits and starts, leaving their title hopes in real jeopardy.
If Rohl – who admits a trophy is a must this season – wants a spot in the Scottish Cup semi-final, Rangers must avoid another Jeckyll and Hyde derby showing on Sunday.
Is this the stage for Andreas Skov Olsen?
The Denmark winger arrived on loan from Wolfsburg in January with a big reputation.
Rangers hold an option to buy for a reported fee of £8.6m but Skov Olsen has struggled to set the heather alight in his first few months.
He's scored one goal in six games and set up a further two while creating 12 chances, including three big chances.
Rohl insists the 26-year-old shouldn't be written off, saying: "We know, and we saw in moments, which parts he can help us with, especially in the final third.
"I think he is also very tactical, intelligent. There is still more to come and this is what we are trying to bring out of him as soon as possible."
Plenty of doubters remain though. Having provided the cross for Chermiti's incredible opener last Sunday before fading along with the rest of his team, Skov Olsen do could with turning it on when Celtic visit again.
Will the defence hold firm?
Rangers have conceded 25 league goals all season – 16 since Rohl took charge in October – but six of those have come in their past three games, including two against bottom club Livingston.
Defensively, they've lost 202 tackles – the most of any Scottish Premiership side – and have blocked the second fewest number of crosses (34).
Rangers have made four errors leading to league goals but have conceded the third fewest goals in the division.
"I think we conceded too much at the moment," Rohl said.
"I think we conceded 16 all in in the league since I've been here. And in the last five games, eight. This is too much and this is also part of what we have to improve."
Rangers will need to shore up their defence if they want to keep Celtic out on Sunday.
