how to prepare this kitchen area

[casioman]

I have this kitchen floor I want to tile but I an not sure how to prepare it. From the photo you will see the main are has quarry tiles that has been screeded with a self leveling compound. For the most part this is ok and intack except where the hole shown in photo is..The area behind the threshold next to doors needs tiling also . This has chipboard at the moment and there has been some water damage at some time in the past. My question is how best to repair the hole in screed and what should I substitute the knackered chipboard for?

 

[DHTiling]

That SLC would have been laid for the vinyl floor and it is possible that it is not fully intact with the said tiles , the choice to tile over the tiles is yours but i prefer to remove old tiles.

As for the chipboard in the back ground... then i would check to see if it is a floating floor first..