Luis Diaz is wearing the No.7 shirt at Porto, and one could imagine that he would be happy to take the same shirt at Liverpool.
However, with James Milner at the club at least until the summer, this number is not available.
Neither is the No.14 shirt that Diaz wears for Colombia - it's occupied by Jordan Henderson.
So, which shirt numbers are available to the likely newcomer? Here are some of them.
No.16 - not the luckiest short for the Reds, the last Liverpool player who can claim to be successful while wearing it was Dietmar Hamann.
No.19 - Ozan Kabak wore this shirt last season but crucially, this was also Sadio Mane's first shirt number at Liverpool.
No.23 - Xherdan Shaqiri wore it last season.
No.25 - the last man to wear it was Pepe Reina in the 2012/13 campaign.
