The Wednesday keeper required treatment following the incident, which Warnock suggested following the match was excessive.
Warnock insisted that he had been hasty with his response and wanted to apologise to Kirkland.
He told Sky Sports News: "Chris is a good professional and I was out order for saying that.
"Nobody should be allowed to come on the pitch and do that to Chris, they pushed him and after seeing it again I can understand why he was mad.
"We talk about chants but everybody was to blame, I got almost 90 minutes of abuse but you get used to it."
The Football Association have confirmed that they will investigate the incident.