What can I do with a griddles chicken breast?

[Fekko]

I cooked it on Friday evening and it's been in foil in the fridge (I forgot it was there).

Can it still be eaten or can I reheat it?

You can reheat it once (20-25 mins @ 180) and tbh I probably would if it's been around since Friday. I'd slice it up first and put it on a pizza to disguise any rubberiness that might entail from it being twice cooked.