The talented Real Betis star has been named as a potential replacement for the outgoing Alberto Moreno to provide competition and cover for Andy Robertson at Anfield.
But the Reds aren't the only side keen on the athletic left-back, with Real Madrid also heavily tipped to make a move.
Firpo has now responded to transfer speculation during the European U21 Championships in Italy.
The 22-year-old, who was born in the Dominican Republic, remained tight-lipped about speculation and insisted he is concentrating on his international commitments.
"Did Madrid call me? If you want to know, you can ask them," he said to El Larguero.