It is understood that the 26-year-old midfielder, who is a target for Napoli, will make the move from Portugal to Anfield after Copa America 2016 having impressed the Reds with his performances in the Primeira Liga over the past few seasons.
Garcia also suggests that Herrera's former club, Pachuca, will be due 30% of the transfer fee which is believed to be around €20million (£15.7m).
Héctor Herrera está a un paso de dejar el Porto para pasar al Liverpool (Pachuca tiene el 30% de sus derechos)
— Vladimir García (@VladimirGarciaG) June 6, 2016
Herrera scored Mexico's third goal as they defeated Uruguay 3-1 in their opening Copa America Group C fixture in Glendale, Arizona on Sunday.