The biggest saga of Europe's summer transfer window ended with Sweden international Isak completing his dream move to the English champions for 125 million pounds ($A259 million), with the deal announced in the final throes of a chaotic deadline day.
"It's been a long journey to get here. But I'm super-happy to be a part of this team, this club and everything it stands for," said Liverpool's new No.9, who effectively went on strike at Saudi-controlled Magpies as he agitated for a move to Anfield.
"It's something I'm proud of and I'm really looking forward to it. I'm happy it's done and that I can get back to work."
On the back of winning the Premier League for a record-tying 20th time, Liverpool have aggressively overhauled their squad and blown rivals out of the water, spending more than any other team in Europe. Germany playmaker Florian Wirtz and young French striker Hugo Ekitike have also joined in deals worth more than $A153 million.
One transfer the Reds failed to get over the line, however, was for England defender Marc Guehi, who will stay at Crystal Palace for the final year of his contract because the London team couldn't secure a replacement.
Arsenal's eighth signing of the window was a loan deal for Ecuador defender Piero Hincapie from beleaguered Bayer Leverkusen.
Other highlights on Monday included Tottenham signing France striker Randal Kolo Muani on loan from Paris Saint-Germain, while Aston Villa were very active in signing Harvey Elliot on loan from Liverpool, Jadon Sancho on loan from Manchester United and former United centre back Victor Lindelof on a free transfer.
United continued trimming their squad by offloading Antony to Real Betis on a permanent deal and Rasmus Hojlund to Napoli on loan, while signing Belgian goalkeeper Senne Lammens from Royal Antwerp in a bid to fix their issues in that department.
Flush with cash from the Isak transfer, Newcastle signed Yoane Wissa from Brentford as a second striker addition along with Nick Woltemade, who joined for a club-record fee on Saturday.
Senegal forward Nicolas Jackson has joined Bayern Munich from Chelsea in what both clubs described as a season-long loan.
With Reuters.
