I think before even thinking of putting an offer in, you might sound out your lender as to whether they would consider lending you €X on the basis that your own house will go on the market at the same time as you are drawing down the mortgage.
It may be that you have enormous cash reserves and that you will only need a small mortgage to purchase the new house - congrats! if that is the case - or, if that is not the case, it may be that your bank would question your ability to service a large mortgage until your own house sells. And if they won't lend, I suspect that ends your prospects.
mf