using wp_sprintf at wordpress option page,

When it comes to user-defined strings, it’s best to use a placeholder or “merge tag” – so on your settings page, inform the user they can use e.g. {blogname}

And then in your code:

$message = get_option( 'option_name' );
$message = str_replace( '{blogname}', get_bloginfo( 'name' ) );

This is less error prone & clearer to the user than using sprintf style arguments.