I don't think he will be expecting to get injured again when he comes back. And Bayern are irrelevant this summer, as they would never have paid the fee (or the reported wages) but if Barca & Real go further down the pan this season, as looks likely, then Leroy, in his last season, will be very tempting for both.
Also, either Ollerdyce will succeed (unlikely) or fail & be sacked maybe replaced by a proper manager. They would pay Leroy 600k pw to play there. Liverpool would be all over him if given the chance.
If I was him, I'd just wait it out now & then he holds all the cards.