Premier League champions Liverpool have signed Alexander Isak from Newcastle United for a British record transfer fee of £125m.

“Liverpool FC have completed the transfer of Alexander Isak from Newcastle United,” Liverpool said in a statement.

“Isak joins the Premier League champions as their new No.9 on a long-term contract, which he signed on deadline day after successfully passing a medical.”

According to BBC Sport, Newcastle sources claim the deal could be worth as much as £130m with add-ons.

Sweden international Isak, 25, had a medical on Monday before signing a six-year contract.

Isak, who will wear the number nine shirt with the Reds, told the Liverpool website: “This is the next step for me in my career. I’m super happy that I’ve been given this chance and I’m very motivated to do something well with it.

“I want to create history. I want to win trophies. That’s ultimately the biggest motivation for me.

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“This is the perfect place for me to grow even further and to take my game to the next level and help the team as well.”

Liverpool had an original £110m offer for Isak rejected in August but have now landed their first-choice target of the summer.

The protracted saga came to an end on the final day of the transfer window, with the Reds announcing the deal two and a half hours after the window closed.

Last season Isak was on the score sheet as Newcastle beat Liverpool 2-1 in the League Cup final.

The win against Liverpool Newcastle’s long wait for a major trophy.