The 19-year old winger came off the bench in the 80th minute to score an injury-time equaliser in Palace's eventual 3-2 Capital One Cup third round defeat to Newcastle United on Wednesday night.
Warnock admitted he took a chance by throwing Kaikai into the fray but was delighted with the outcome as the former Crawley Town man gave the Eagles a chance before Paul Dummett's extra-time header ended the south London club's run in the league cup.
"I've only seen him a couple of times, but I'd just felt we'd nothing to lose," said Warnock.
"He scored a couple of good 'uns in the week I came in another game.
"He's always likely to score a goal.
"If young lads do well they deserve a chance.
"I couldn't possibly have played anyone who had played Everton (in the 3-1 win on the weekend) because of the amount of work we did up there.
"We can't get carried away with it all just yet, he's very young and working hard in our set-up.
"But it's great for him to have a chance and to take that opportunity."
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