But he believes whoever succeeds him in the job will receive the full benefit of GFH Capital's backing.
Warnock walked away from Leeds on Monday, tendering his resignation following the 2-1 defeat to Derby at Elland Road.
The 64-year-old signed an 18-month deal to replace Simon Grayson in February last year and openly said it would be his last job, with the sole aim being to get a record eighth promotion before retirement.
The home loss to the Rams leaves Leeds 12th in the Championship table, eight points adrift of the play-off places with six matches remaining.
GFH Capital completed their takeover of the club in December and Warnock believes he would have been able to do more had he been given money to spend in the January transfer window.
"I always said I was going to leave if we didn't achieve promotion this year," Warnock told Sky Sports News. "Getting Neil Redfearn and Gwyn Williams in until the end of the season will give them a bit of breathing space and allow them to get the right man in.
"I was instrumental in getting them (GFH) on board. They came in a little too late for January but the new manager will get the benefit of that.
"They are not really football people but they are aware of the quality we need now. We needed two or three forwards and we suggested some but they wanted to come in and see what the club needed - I wanted it instantaneously.
"There is a very good squad but it needs that bit of quality like a Robert Snodgrass would have given us. It's been difficult but we could still have got into the play-offs."
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