Should the long-serving Brazilian depart Stamford Bridge then there is expected to be plenty of suitors - Barcelona, Tottenham Hotspur, Arsenal and Paris Saint-Germain are just some of the clubs to have been credited with an interest.
With that in mind, here Sports Mole has taken a look at which shirt number the 31-year-old could take if he makes the move to Anfield.
A more likely option would be to revert to the number 22 shirt he held for the first six years of his Chelsea career and for the first two seasons of his professional career at Shakhtar Donetsk.
That number is currently taken at Liverpool and is usually reserved for a third-choice goalkeeper, but if Willian really pushed for it he would likely be granted it ahead of current occupant Andy Lonergan.
Indeed, the only number other than 10 and 22 he has worn at club level is the 88 shirt for one season at Anzhi Makhachkala, and that is unsurprisingly vacant for Liverpool at the moment.
Another option could be the number 19 he has regularly worn for Brazil, with that shirt also currently vacant after Mane switched to number 10 in 2018-19.