The Foxes are among the league's highest scorers so far this season and also boast 15-goal Jamie Vardy in their ranks, although the England international has failed to score in his last six league games.
"We have our eyes open. If there is a good opportunity for us, we are ready. Now I want another attacking player - a striker. I am very confident. My staff is fabulous, every day they are working, because when I ask about something they are ready. I'd like to do my business as soon as possible," Ranieri told reporters.
"Andrej wasn't the main striker, he was more behind Vardy. But behind Vardy I prefer Leonardo Ulloa and Shinji Okazaki, because Ulloa covers the ball very well, he's a fighter, and Okazaki is another who presses everybody every second.
"Kramaric has fantastic skill but sometimes he rests and recovers. This team can't recover, they need to run, run, run. When I say we are building a good team, I would like to have two players for each position, so when I change, you don't see the difference. Kramaric didn't play, I have Ulloa, Okazaki and Vardy so I need one more I can change so the result is the same, I will have good strikers on the pitch."