Georginio Wijnaldum is the latest magpie to leave the club in an overhaul of the squad that Benitez is shaping to create a squad capable of winning the Championship.
Wijnaldum has already outlined what he wants to achieve during his time at the club, and revealed that manager Jurgen Klopp played a big part in him joining the Merseyside outfit.
The Reds have had a bid of around £25million accepted by Newcastle for the midfielder, reports the Liverpool Echo. "We just knew that we would get assists from him, goals from him and that was the sort of thing that stood out to us".
Past year I didn't watch him too much but I never forgot how well he performed at Eindhoven and as a very young boy in Rotterdam. The 25-year-old becomes Jürgen Klopp's seventh newcomer of the summer, following the moves of Loris Karius, Joel Matip, Marko Grujic, Sadio Mané, Ragnar Klavan and Alex Manninger to Anfield.
Do you feel Jurgen Klopp has made the right signings so far?
Alison Bender looks at whether Georginio Wijnaldum will be a good fit for Liverpool, as the Reds close in on a £25m deal.
Liverpool boss Klopp talks up new signing Wijnaldum
Wijnaldum was the club's top goal scorer last season, netting 11 times, but rumours of him leaving the club have been going around since Newcastle's relegation from the Premier League.
Using him in a central duo could be unsafe, as the Reds may find they get overrun, but if he's willing to help press-and if he's partnered with a workhorse like James Milner or Jordan Henderson-it could work out.
He has donned the No.5 at Feyenoord and Newcastle - and will do the same now after completing his move to Liverpool.
"Gini was a good player and we allowed him to go to a Premier League club".
"That's really important. I think he can be a great player for us".
It will be hard to immediately replace Wijnaldum, but this could lead to Benitez barring a deal for Sissoko to avoid losing two top midfielders at the club.