If Alexander Isak leaves Newcastle for £150 million, he will become the 3rd most expensive player in the history of world football, after Neymar and Kylian Mbappe when joining PSG.
However, the figure for the team to own Isak will not stop at 150 million pounds, with countless accompanying fees. First, the total value of this deal immediately after being signed could reach 171 million pounds. This difference is a commission for the agent and the management company. If this contract is transferred in UK territory, it will lose an additional 4%.
In terms of the Premier League's profit and sustainability rules (PSR), spread across a 5-year contract, that fee alone has added £33-35 million to the club's spending.
As for Isak, it is unclear how much salary the Swedish striker requires, but for the top 3 top scorers last season, the number is predicted to be no less than 250,000 pounds/week. Therefore, the salary payable to Isak will be around the minimum of £15 million/year.
Signing Isak will cost the club an additional £50 million a year (not including arising expenses). The clubs will have to pay cash, so in a hypothetical 5-year contract, Isak could cost the club that bought him more than £250 million.

Among the teams outside the Premier League at the moment, almost none are willing to spend up to 150 million pounds to buy Alexander Isak. Most recently, Bayern Munich detonated Liverpool's blockbuster Luis Diaz for nearly 70 million pounds, but that was also a huge amount compared to the "Gray Tigers" spend habits. Above all, they, like many other big teams, have a top center forward so they do not need an expensive deal like Isak.
In the Premier League at the moment, Chelsea and Man City are the two teams with the most financial space according to PSR principle. However, all did not need Isak because he had reasonable strikers. Chelsea have just bought Joao Pedro and Liam Delap, not to mention Nicolas Jackson. Meanwhile, Man City owns Erling Haaland, the world's leading striker today.
The team that has been rumored to have bought Isak in recent days is Liverpool. Despite spending more than £300 million this summer, The Kop are still Isak's potential Premier League destination. The Anfield team will need to sell many players to balance finances if they decide to pay for this deal. The departure of Luis Diaz, Darwin Nunez or Harvey Elliott, or even all three, will help increase profits and cash flow, while helping them return to the sustainability policy that FSG has promoted for more than a decade.
Liverpool have spent a lot this summer thanks to careful financial management. That has helped them maintain their position in the deal to chase Isak, even with a huge asking price from Newcastle. Liverpool have low transfer loans, strong cash flow, skyrocketing revenue and owning many assets that can be sold, helping to compensate for current and future losses.
Having once declared his desire to leave Newcastle, Isak's chance to stay at St. Petersburg James' Park is no longer around. He was forced to find a destination to continue his career and is hoping that it will be Liverpool, the reigning Premier League champions. If this deal was a failure, perhaps only the Saudi Pro League could save Isak, but by then, he had somewhat buried his career at its peak.