The Celtic boss believes the Scottish Cup semi-final clash with the Gers will be a much more difficult affair than last season's meeting.
Celtic manager Ronny Deila has told reporters that there is unlikely to be a repeat of the Bhoys' comfortable victory over Rangers last season when the arch-rivals meet in the Scottish Cup semi-final next month, as quoted by the Scottish Sun.
Deila's side cruised to a 2-0 win over the Gers in the semi-final of the Scottish League Cup at Hampden Park last year on their way to winning the trophy.
However, under new manager Mark Warburton, the Hoops' rivals have lost just three times in 38 matches in all competitions this season and look certainties to return to the Scottish Premiership after a four-year absence.
Deila admitted that his side are likely to find it a much tougher task when they come up against their Glasgow neighbours in April, and said that Rangers have become a force to be reckoned with.
The Norwegian told reporters, as quoted by the Scottish Sun: "I think Rangers have been better than last year. You can see that their results are much better.
"It's a game we really look forward to. It's going to be a big, big game and something to be happy for. We will do everything we can to get the same result as we got against them the last time and get into a cup final."
Before that tie, however, Celtic must focus on getting their Premiership title challenge back on track after dropping points in each of their last two matches.
That stutter has seen their lead over Aberdeen at the top of the table cut to just a point, although they have a game in hand over the Dons.
The Bhoys travel to Partick Thistle on Saturday, whilst Rangers face Greenock Morton on Friday evening.