A Tesco spokesman said:
This product was uploaded to the website by a third party seller but was removed from sale immediately because we found it offensive.
The webpage should have been removed at that time and we are looking into why it is still visible two months later.
We have very clear guidelines for third party sellers who list items on our website, and are very sorry that on this occasion they weren't followed.
More top news
A man caught with dozens of turtles inside his pants is to face a court under the US justice system.
Too many family homes are being built around the size of a bathroom too small for people to live in them comfortably, a report says.
The numbers of female officers in police forces must be boosted further as they tackle the "changing face of crime", Theresa May will say.