Unspent per diem allowance declaration

Hi Guys,

I have a query on the declaration of unspent per-diem allowance. I have travelled to europe in august last year on company's behalf and carried back some unspent per-diem allowance in euros. I didnt declared this amount that time to the employer so I am worried whether can I declare it in ITR under income from other sources so that to properly consider it as taxable income in this assessment year 2017-18?

Any help would be highly appreciated.

Thanks