"On his day, he is unplayable," Shearer told talkSPORT. "I said it when he left Newcastle. On his day he was like big Duncan Ferguson. He is very, very similar.
"If that ball is right and they get them balls into the box then, more often than not, he will beat you in the air and he will get his header on target.
"The whole system at Newcastle was designed for Andy Carroll. Once the full-back got it he moved it out his feet and whipped it up to Andy Carroll, once the wide midfielder got it he moved it out his feet and whipped into the box to Andy Carroll.
"The whole system was designed for him and he thrived on that. At times he looked a great player. But at Liverpool he plays a slightly different way and the service hasn't been as good as it was at Newcastle. He's suffered from that.
"Kenny hasn't really found a formula that works with him and [Luis] Suarez. Whether that will come next season, I don't know, but if you give him the right service then he is a very, very good player."