The Ibrox side were beaten 1-0 by Aberdeen at Hampden on Sunday and re-iterated his warning for players to "step up".
We've not had an Old Firm final for a good few years so it would have been incredible to be involved in that.
This was a painful outcome for Steven Gerrard and Rangers at Hampden, and one they scarcely deserved. At a big club, we expect big players to step up on big occasions and provide big moments.
Kilmarnock, managed by Gerrard's former Liverpool colleague Steve Clarke, travel to Ibrox three points and three places ahead of Rangers.
Rangers will be bolstered up front for the game with the return of strikers Alfredo Morelos and Kyle Lafferty, who he added will "for sure" make up for some of what has been lacking in the final third.
"If that doesn't happen, at any big club, the managers and the recruitment will find better players or players who will do that". We wanted to push them back and that would allow our creative players to get into space and try to influence things. We found it hard at sometimes during the game to lose them.
Rangers now sit in fifth position in the Scottish Premiership.
The showpiece takes place on December 2nd, but before then, Brendan Rodgers and his side have a lot to overcome - not least a crucial game against RB Leipzig a week on Thursday at Parkhead.
"But we are improving and moving forward so I think the scouting department deserve credit".