Ibrox side Glasgow Rangers are due to meet Celtic on the Scottish League Cup semi-final on Sunday.
Rangers and Celtic are due to meet at Hampden Park in the Scottish League Cup semi-final on Sunday.
The Glasgow rivals have already faced each other once this season, and Celtic triumphed in comfortable fashion on that occasion.
Rangers were humiliated by their rivals when the two sides last met, with Brendan Rodgers’ men picking up a 5-1 victory.
However, Warburton insists that his Rangers team are a different prospect now their new signings have started to settle in.
“We had Josh, we had Joe, we had Philippe, a number of new players, coming into the side and making debuts,” Warburton said.
“We have moved on. We have gelled as a squad, we are getting better.
“It is early days, we are nine games in to the league season but it is taking shape and our performance level has improved dramatically in the last four, five weeks.”
Rangers did start the season slowly, but since their defeat against Celtic they have started to improve.
Rangers have won three of their last four matches to build up some momentum.
When Rangers and Celtic met in the semi-final of the Scottish Cup last season, Warburton’s side ran out winners on penalties.