@Biswapriyo, after they've already deleted it, if they have other posts on the site, you could leave a temporary comment there suggesting that they undelete it (if you can no longer see the post or don't remember their username, a 10K user could see that if you have a link). If they don't have any other posts on the site, you could leave a comment on a post of theirs on another site if you can find one.