Chelsea are the first of the Premier League's top six to flex their financial muscle in the January transfer window.
After much speculation, the Blues sealed a £58m deal for highly-rated Borussia Dortmund winger Christian Pulisic.
The American had 18 months left on his contract with the German club and will be loaned back there for the remainder of the 2018/19 season.
While it's quite a sizeable price tag for a relatively unproven 20-year-old, Pulisic's potential is undeniable and he will be a gateway for Chelsea to make some serious money from the American market.
Pulisic will also offer the Blues a young, exciting option to replace the ageing pair of Willian and Pedro Rodriguez.
Chelsea really could have done with Pulisic in the drab 0-0 draw with Southampton last night.
Sarri's side looked lost for ideas at Stamford Bridge, with both Arsenal and Manchester United making ground on them in the race for top four.
And after the game, the Chelsea boss raised more questions among fans after he admitted he didn't know the club were bringing Pulisic in so quickly.
Sarri said in his post-match press conference: "I didn't know anything about Pulisic yesterday. The club asked my opinion about him one month ago. My opinion was positive and today I've known that the deal is done."
As expected, Chelsea fans were not entirely convinced by his admission.
If Sarri is not heavily involved in transfers, then what about the deal to bring Jorginho with him from Napoli?
CHELSEA FANS REACT
Some Chelsea fans have pointed out that they believe Sarri was simply saying he was unaware of the deal, not the player itself.
With Chelsea struggling to find consistency of late, the Pulisic deal seems unlikely to be the Blues' last piece of business this January.