The deal is set to be announced on Friday, according to newspapers in Italy and South America.
The 22-year-old will join Lazio from Chilean club Rangers Talca on loan until the end of the season.
Lazio have an option to but the former Boca Juniors striker for £2million at the end of the season.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?