First I can find. A Spurs rumour page credited some guy, I checked his page, and he credited this guy. Can't find anything with an earlier timestamp, and this lad certainly doesn't seem the sort to be messing around in Photoshop - he's certainly not playing the picture up.
Nothing from Sky or any papers even to say they have been allowed to talk to Pochettino. With something like this you wouldn't be able to keep it so quiet that only a dodgy pic is all there is to show.