Georginio Wijnaldum is expected to complete his £25 million move to Liverpool within the next 24 hours, with a medical scheduled for Friday.
The Reds agreed a fee with Newcastle United, thought to be £23 million up-front with a further £2 million included in add-ons, for Wijnaldum on Thursday after Jürgen Klopp pressed ahead with the transfer.
The attacking midfielder will undergo a medical on Friday before travelling to the United States to join up with his new teammates on their 12-day pre-season tour.
Several reports, including Sky Sports, suggested that he was at the club's Melwood training ground on Thursday to begin his medical but will complete the second part - and all the formalities - the following day.
After his medical is officially completed, Wijnaldum is expected to jet off to Palo Alto in California where Liverpool's first-team are based for the next week.
Dutch international Wijnaldum said his farewells to his Newcastle teammates, as well as the club's staff, after making his final appearance in their 2-2 pre-season friendly draw with Doncaster Rovers on Wednesday night, coming off the bench for the final 13 minutes.
He is expected to sign a five-year contract on Merseyside, which increases his wages by £15,000-a-week up to around £75,000.
Wijnaldum to become Reds' sixth summer arrival
Despite Magpies boss Rafael Benitez having been linked with moves for Lucas Leiva or Jon Flanagan as part of the deal, the package will consist of just money rather than any players in exchange.
However, loan deals in the future are a possibility because of the relationship between Klopp and former Liverpool manager Benitez.
The Reds beat off competition from Everton and Tottenham Hotspur to land Wijnaldum, both of whom were put off by Newcastle's price tag - which was initially believed to be around £27 million before they settled for slightly less.
Wijnaldum only moved to England last summer from PSV Eindhoven, sealing a £14.5 million move after captaining the Eredivisie outfit to the title in the 2014-15 campaign.
The 25-year-old ended his first season on the North East as Newcastle's top goalscorer with 11 strikes in all competitions but could not prevent them slipping to relegation despite featuring in all 38 of their Premier League games.
Only five players will have cost more than Wijnaldum, if the add-ons in the deal are eventually exercised, as he becomes the sixth signing under Klopp.
Following Joel Matip, Marko Grujic, Loris Karius, Sadio Mane and most recently defender Ragnar Klavan - Klopp could yet look for more midfield reinforcements in the next few weeks.
Long-serving Lucas' future is uncertain, while Liverpool accepted a £13 million bid from Stoke City for Joe Allen earlier in the week and are believed to be in advanced talks over a transfer.
Klopp is also believed to still be keen on a deal for Leicester City left-back Ben Chilwell, despite the reigning champions demanding at least £10 million to enter talks over the 19-year-old.
Jon Flanagan could also be on his way out, though only on a temporary basis, having remainded on Merseyside to be make up his mind on whether he wants to spent the coming season at Burnley.