neither can (one)
One is also incapable of doing something. A: "The crowd is screaming so much I can't even hear the band!" B: "Neither can I—let's get out of here." A: "I can't believe Janet's bosses would do something like that to her." B: "Yeah, neither could she."
Neither can I
1. I cannot do that either. (Any subject pronoun can be used in place of I.) Bill: No matter what they do to them, I just can't stand sweet potatoes! Bob: Neither can I. John: Let's go. I cannot tolerate the smoke in here. Jane: Neither can I.