The source claims that Sarri has already started working on a list of targets, with Chelsea's Ruben Loftus-Cheek on top of it.
The 25-year-old enjoyed the best spell of his career at Chelsea when the Italian was in charge, scoring 10 goals in 40 appearances before a severe Achilles injury ended his run.
Now, Loftus-Cheek has fallen behind in the pecking order, and his loan at Fulham did not help his cause.
However, Sarri is confident that the midfielder can flourish in his system again, with his versatility and goalscoring threat being the key assets.
That's why Lazio are considering bringing Loftus-Cheek on loan with an option to buy, like the one that saw Fikayo Tomori move to another Italian club and become a revelation there over the past five months.