But he admitted personal regrets after top goalscorer Alfredo Morelos was ruled out of the Hampden trip along with the cup-tied Kyle Lafferty after being sent off in the quarter-final.
'Well I think at any big club.' Rossiter began, before Gerrard immediately took over.
"We are going into what I would probably class as a more hard run of fixtures, with all due respect to the teams we have just played". I thought we played really well within the game and we got caught on a sucker-punch of a counter-attack.
The result comes three days after League Cup semi-final defeat to Aberdeen and the Gers boss says he had some strong words for his squad at the final whistle. At a big club, we expect big players to step up on big occasions and provide big moments.
Gerrard vowed to find better players in the final third if those who failed to find the net against the Dons do not improve.
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Kilmarnock, managed by Gerrard's former Liverpool colleague Steve Clarke, travel to Ibrox three points and three places ahead of Rangers.
SPFL chief executive Neil Doncaster said: "I'm pleased that we've been able to reach an outcome that allows both clubs to finalise their ticket arrangements for what should be a showcase Betfred Cup final at Hampden Park". "And he's got a good team and good players".
I pick the XI, I brought in 14 players in the summer.
We have to prepare properly to arrive at that game with confidence to make sure we get the job done.
We've not had an Old Firm final for a good few years so it would have been incredible to be involved in that.
And Gerrard wants more from himself and his players.