Are you sure about that, Mr Trench? These don't look like seed potatoes, just old spuds that haven't been stored properly. I would bin these and get proper seed potatoes. There is still time to get them chitted and planted. There is no telling whether or not they are diseased, and the sprouts will probably break off if an attempt is made to plant them.They are super-chitted.
They'll be fine - just follow the instructions in the previous post.