My father suddently lost memory of what happened today and the days before, he seems to be shocked, his favourite team lost today and when he came home i noticed that he forgot everything.. he doesn't even remember where he put his stuff recently?

It is time to take your father in to see a doctor and get a complete examination and advice.

In cases of vascular dementia and Alzheimer disease with dementia, memory loss is quite gradual and not sudden. Did you notice mild loss of cognitive function in your father during recent months or years? Sudden loss of memory coukd be a stroke or other types of brain pathology,but can be less serious Transient Global Amnesia. A neurologist is best to evaluate your father with appropriate testing

There are many conditions which can cause the mentioned scenario and they are all serious medical conditions. Some conditions may be transitory whereas others may represent a progressive, neurologic, degenerative condition. He should be immediately evaluated by an appropriately trained health care provider.

Agree that most likely cause of "sudden" memory loss maybe due to transient global amnesia or a stroke. The former is indeed short-term but effects of the latter will persist and can provide future further disability. A new medication causing intense anti-cholinergic adverse effects could also be considered, as well as toxin exposure. See your local doctor.