Unfortunately, you cannot offset these losses against your employment income.
Foreign rental income is assessed under what is known as 'Schedule D Case III', giving scope to offset foreign rental losses against other Case III income (e.g. UK source interest). Perhaps there's scope for you to move any savings you may have from products yielding deposit interest subject to DIRT (and therefore assessable under 'Case IV') to a product yielding income assessable under 'Case III'?
If we're talking about residential property, you should calculate your rental profit or loss based on Irish tax principles (e.g. only 75% of interest arising in respect of the purchase, improvement or repair of a property should be allowable).
You should also be mindful of your filing and payment obligations in the foreign jurisdiction.
And if you do at some point in the future crystalise a capital loss in relation to a property, the loss should be available to you for offset against any future capital gains.