The newspaper report that the two clubs agreed on a fee on Saturday after negotiating for three days, with Watford’s initial resistance to the deal fading.
The Mail claim that Marco Silva played an instrumental part in making the deal happen, with Richarlison now set to travel to Merseyside to complete the move.
The Brazilian was mightily impressive under Silva to start last season, netting five goals before November, but the upheaval at Vicarage Road seemed to affect the youngster badly, and he failed to score again in 2017/18.